• #<Class:0x007f4a31e7cca0>#block in _app_views_students__form_html_erb__2009216249118948621_69978172388160 /home/z/test_rails/school/app/views/students/_form.html.erb:1
  • #<Class:0x007f4a31e7cca0>#form_for $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:428
    • Kernel#block_given? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:429
    • Module#=== $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:433
    • Module#=== $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:433
    • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:437
    • #<Class:0x007f4a31e7cca0>#model_name_from_record_or_class $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:8
      • #<Class:0x007f4a31e7cca0>#convert_to_model $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:4
        • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
          • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
            • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
          • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
          • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
          • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
        • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
      • Student#model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
        • Kernel#class $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
        • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
    • #<Class:0x007f4a31e7cca0>#apply_form_for_options! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:457
      • #<Class:0x007f4a31e7cca0>#convert_to_model $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:4
        • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
          • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
            • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
          • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
          • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
          • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
        • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
      • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
        • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
          • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
        • Symbol#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
        • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
        • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
        • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
      • Student#persisted? $GemPath0/gems/activerecord-5.0.4/lib/active_record/persistence.rb:98
        • Student#sync_with_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:498
          • Student#update_attributes_from_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:502
      • #<Class:0x007f4a31e7cca0>#dom_class $GemPath0/gems/actionview-5.0.4/lib/action_view/record_identifier.rb:72
        • #<Class:0x007f4a31e7cca0>#model_name_from_record_or_class $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:8
          • #<Class:0x007f4a31e7cca0>#convert_to_model $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:4
            • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
              • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
              • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
              • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
              • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
            • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
          • Student#model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
            • Kernel#class $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
            • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
        • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/record_identifier.rb:74
      • #<Class:0x007f4a31e7cca0>#dom_id $GemPath0/gems/actionview-5.0.4/lib/action_view/record_identifier.rb:87
        • #<Class:0x007f4a31e7cca0>#record_key_for_dom_id $GemPath0/gems/actionview-5.0.4/lib/action_view/record_identifier.rb:105
          • #<Class:0x007f4a31e7cca0>#convert_to_model $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:4
            • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
              • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
              • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
              • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
              • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
            • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
          • Student#to_key $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/primary_key.rb:10
            • Student#sync_with_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:498
              • Student#update_attributes_from_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:502
            • Student#__temp__e6f6 $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:34
              • Student#_read_attribute $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:65
                • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:66
                • ActiveRecord::AttributeSet#fetch_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:43
                  • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:11
                    • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:41
                      • ActiveRecord::LazyAttributeHash#assign_default_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:118
                        • Hash#fetch $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:119
                        • Hash#fetch $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:121
                        • ActiveRecord::Attribute.from_database $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:4
                          • Class#new $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:5
                            • ActiveRecord::Attribute::FromDatabase#initialize $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:29
                  • ActiveRecord::Attribute::FromDatabase#value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:36
                    • ActiveRecord::Attribute::FromDatabase#type_cast $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:139
                      • ActiveModel::Type::String#deserialize $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/value.rb:21
                        • ActiveModel::Type::String#cast $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/value.rb:35
                          • Kernel#nil? $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/value.rb:36
                          • ActiveModel::Type::String#cast_value $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:14
                            • Module#=== $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:16
                            • Class#new $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:16
                              • String#initialize $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:16
          • Array#join $GemPath0/gems/actionview-5.0.4/lib/action_view/record_identifier.rb:107
        • #<Class:0x007f4a31e7cca0>#dom_class $GemPath0/gems/actionview-5.0.4/lib/action_view/record_identifier.rb:72
          • #<Class:0x007f4a31e7cca0>#model_name_from_record_or_class $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:8
            • #<Class:0x007f4a31e7cca0>#convert_to_model $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:4
              • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                  • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
              • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
            • Student#model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
              • Kernel#class $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
              • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/record_identifier.rb:74
      • Array#compact $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:465
      • Array#join $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:465
      • String#presence $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:41
        • String#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
          • String#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:114
            • Regexp#=== $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:118
      • Hash#reverse_merge! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/reverse_merge.rb:17
        • Hash#merge! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/reverse_merge.rb:19
      • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:469
      • #<Class:0x007f4a31e7cca0>#polymorphic_path $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:119
        • Module#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:120
        • Kernel#dup $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:126
          • Kernel#initialize_dup $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:126
            • Hash#initialize_copy $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:126
        • Hash#delete $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:127
        • ActionDispatch::Routing::PolymorphicRoutes::HelperMethodBuilder.polymorphic_method $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:189
          • ActionDispatch::Routing::PolymorphicRoutes::HelperMethodBuilder.get $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:163
            • Symbol#to_s $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:164
            • Hash#fetch $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:165
          • Module#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:193
          • Module#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:203
          • Module#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:203
          • Module#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:205
          • NilClass#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:208
            • BasicObject#== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:208
          • ActionDispatch::Routing::PolymorphicRoutes::HelperMethodBuilder#handle_model $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:246
            • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
            • Student#persisted? $GemPath0/gems/activerecord-5.0.4/lib/active_record/persistence.rb:98
              • Student#sync_with_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:498
                • Student#update_attributes_from_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:502
            • Student#model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
              • Kernel#class $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
              • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
            • ActionDispatch::Routing::PolymorphicRoutes::HelperMethodBuilder#get_method_for_string $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/polymorphic_routes.rb:313
          • #<Class:0x007f4a31e7cca0>#student_path -> block (2 levels) in define_url_helper $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:283
            • #<Class:0x007f4a31e7cca0>#block (2 levels) in define_url_helper $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:283
              • Array#last $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:284
              • Module#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:286
              • Module#=== $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:288
              • ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper::OptimizedUrlHelper#call $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:171
                • ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper::OptimizedUrlHelper#optimize_routes_generation? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:191
                  • #<Class:0x007f4a31e7cca0>#optimize_routes_generation? $GemPath0/gems/actionview-5.0.4/lib/action_view/routing_url_for.rb:131
                    • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/routing_url_for.rb:132
                    • StudentsController#optimize_routes_generation? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/url_for.rb:197
                      • StudentsController#_routes -> block (2 levels) in url_helpers $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:489
                        • StudentsController#block (2 levels) in url_helpers $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:489
                      • ActionDispatch::Routing::RouteSet#optimize_routes_generation? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:668
                      • StudentsController#default_url_options -> block (2 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:110
                        • StudentsController#block (2 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:110
                          • Kernel#instance_variable_defined? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:111
                          • Kernel#class $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:114
                          • Kernel#public_send $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:114
                            • StudentsController.default_url_options -> block (4 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:90
                              • StudentsController.block (4 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:90
                • #<Class:0x007f4a31e7cca0>#url_options $GemPath0/gems/actionview-5.0.4/lib/action_view/routing_url_for.rb:121
                  • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/routing_url_for.rb:122
                  • StudentsController#url_options $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:28
                    • ActionDispatch::Request#host $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:247
                      • ActionDispatch::Request#raw_host_with_port $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:231
                        • ActionDispatch::Request#x_forwarded_host $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/request.rb:46
                          • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                        • NilClass#presence $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:41
                          • NilClass#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                            • NilClass#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:52
                        • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                      • String#sub $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:248
                    • ActionDispatch::Request#optional_port $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:330
                      • ActionDispatch::Request#standard_port? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:314
                        • ActionDispatch::Request#port $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:278
                          • ActionDispatch::Request#raw_host_with_port $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:231
                            • ActionDispatch::Request#x_forwarded_host $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/request.rb:46
                              • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                            • NilClass#presence $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:41
                              • NilClass#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                                • NilClass#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:52
                            • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                          • String#to_i $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:281
                        • ActionDispatch::Request#standard_port $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:296
                          • ActionDispatch::Request#protocol $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:216
                            • ActionDispatch::Request#ssl? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/request.rb:393
                              • ActionDispatch::Request#ssl? $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:252
                                • ActionDispatch::Request#scheme $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:186
                                  • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                  • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                  • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                  • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                  • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                              • ActionDispatch::Request#scheme $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:186
                                • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                                • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                      • ActionDispatch::Request#port $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:278
                    • ActionDispatch::Request#protocol $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:216
                    • ActionDispatch::Request#path_parameters $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/parameters.rb:71
                      • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                    • StudentsController#url_options $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/url_for.rb:112
                      • StudentsController#default_url_options -> block (2 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:110
                        • StudentsController#block (2 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:110
                          • Kernel#instance_variable_defined? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:111
                          • Kernel#class $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:114
                          • Kernel#public_send $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:114
                            • StudentsController.default_url_options -> block (4 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:90
                              • StudentsController.block (4 levels) in class_attribute $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/class/attribute.rb:90
                    • Hash#merge! $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:34
                    • Kernel#freeze $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:34
                    • StudentsController#_routes -> block (2 levels) in url_helpers $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:489
                      • StudentsController#block (2 levels) in url_helpers $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:489
                    • ActionDispatch::Request#routes $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/request.rb:128
                      • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                    • BasicObject#equal? $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:36
                    • Kernel#dup $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:40
                      • Kernel#initialize_dup $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:40
                        • Hash#initialize_copy $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:40
                    • ActionDispatch::Request#script_name $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:127
                      • ActionDispatch::Request#get_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:50
                      • String#to_s $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:127
                    • Kernel#freeze $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/url_for.rb:50
                • Hash#merge $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:173
                  • Kernel#initialize_dup $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:173
                    • Hash#initialize_copy $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:173
                • ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper::OptimizedUrlHelper#optimized_helper $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:183
                  • ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper::OptimizedUrlHelper#parameterize_args $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:195
                    • Integer#times $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:197
                      • ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper::OptimizedUrlHelper#block in parameterize_args $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:197
                        • Student#to_param $GemPath0/gems/activerecord-5.0.4/lib/active_record/integration.rb:40
                          • Student#__temp__e6f6 $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:34
                            • Student#_read_attribute $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:65
                              • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:66
                              • ActiveRecord::AttributeSet#fetch_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:43
                                • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:11
                                  • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:41
                                • ActiveRecord::Attribute::FromDatabase#value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:36
                          • Student#__temp__e6f6 $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:34
                            • Student#_read_attribute $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:65
                              • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:66
                              • ActiveRecord::AttributeSet#fetch_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:43
                                • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:11
                                  • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:41
                                • ActiveRecord::Attribute::FromDatabase#value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:36
                          • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/integration.rb:42
                        • Kernel#nil? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:200
                  • ActionDispatch::Journey::Route#format $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/route.rb:120
                    • ActionDispatch::Journey::Format#evaluate $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:35
                      • Kernel#dup $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:36
                        • Kernel#initialize_dup $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:36
                          • Array#initialize_copy $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:36
                      • Array#each $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:38
                        • ActionDispatch::Journey::Format#block in evaluate $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:38
                          • #<Class:0x007f4a5f39b178>#name $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:40
                          • ActionDispatch::Journey::Format::Parameter#escape $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:9
                            • #<Class:0x007f4a5f39b178>#escaper $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:9
                            • ActionDispatch::Journey::Format.block in <class:Format> $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:6
                              • ActionDispatch::Journey::Router::Utils.escape_segment $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/router/utils.rb:79
                                • String#to_s $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/router/utils.rb:80
                                • ActionDispatch::Journey::Router::Utils::UriEncoder#escape_segment $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/router/utils.rb:52
                                  • ActionDispatch::Journey::Router::Utils::UriEncoder#escape $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/router/utils.rb:62
                                    • String#gsub $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/router/utils.rb:63
                                    • String#force_encoding $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/router/utils.rb:63
                      • Array#each $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:45
                        • ActionDispatch::Journey::Format#block in evaluate $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:45
                          • ActionDispatch::Journey::Format#evaluate $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:35
                            • Kernel#dup $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:36
                              • Kernel#initialize_dup $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:36
                                • Array#initialize_copy $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:36
                            • Array#each $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:38
                              • ActionDispatch::Journey::Format#block in evaluate $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:38
                                • #<Class:0x007f4a5f39b178>#name $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:40
                      • Array#join $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/journey/visitors.rb:47
                • ActionDispatch::Routing::RouteSet.block in <class:RouteSet> $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/routing/route_set.rb:302
                  • ActionDispatch::Http::URL.path_for $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:68
                    • String#to_s $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:69
                    • String#chomp $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:69
                    • Hash#key? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:70
                    • Hash#key? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:73
                    • Hash#key? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/http/url.rb:74
    • Hash#has_key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:443
    • Hash#has_key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:444
    • Hash#has_key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:445
    • Hash#has_key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:446
    • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:447
    • #<Class:0x007f4a31e7cca0>#instantiate_builder $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1178
      • Module#=== $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1180
      • #<Class:0x007f4a31e7cca0>#default_form_builder_class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1192
        • ActionView::Base.default_form_builder $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/module/attribute_accessors.rb:60
        • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1194
      • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1189
        • ActionView::Helpers::FormBuilder#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1284
          • Hash#slice $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:21
            • Kernel#respond_to? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:22
            • Kernel#class $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
            • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
              • Hash#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
            • Enumerable#each_with_object $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
              • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
                • Hash#block in slice $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
                  • Hash#has_key? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
                • Hash#block in slice $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
                  • Hash#has_key? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/slice.rb:23
          • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1288
          • String#match $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1288
            • Regexp#match $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1288
    • #<Class:0x007f4a31e7cca0>#capture $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:37
      • #<Class:0x007f4a31e7cca0>#with_output_buffer $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:195
        • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:197
          • ActionView::OutputBuffer#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:5
            • ActionView::OutputBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
              • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
            • String#encode! $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:7
        • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:198
        • String#encoding $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:199
        • String#force_encoding $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:199
        • #<Class:0x007f4a31e7cca0>#block in capture $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:39
          • #<Class:0x007f4a31e7cca0>#block (2 levels) in _app_views_students__form_html_erb__2009216249118948621_69978172388160 /home/z/test_rails/school/app/views/students/_form.html.erb:1
            • ActionView::OutputBuffer#safe_concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:169
              • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:171
            • ActionView::Helpers::FormBuilder#label $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1637
              • ActionView::Helpers::FormBuilder#objectify_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1867
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
              • #<Class:0x007f4a31e7cca0>#label $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:771
                • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:772
                  • ActionView::Helpers::Tags::Label#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:28
                    • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:31
                    • ActionView::Helpers::Tags::Label#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:10
                      • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:15
                      • ActionView::Helpers::Tags::Label#retrieve_object $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:55
                      • #<Class:Regexp>#last_match $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:18
                • ActionView::Helpers::Tags::Label#render $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:42
                  • Hash#stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:37
                    • Hash#transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:12
                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:13
                      • Hash#each_key $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:44
                  • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:45
                    • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:45
                      • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:45
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:50
                  • ActionView::Helpers::Tags::Label#add_default_name_and_id_for_value $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:75
                    • NilClass#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:76
                    • ActionView::Helpers::Tags::Label#add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:88
                      • ActionView::Helpers::Tags::Label#name_and_id_index $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:161
                        • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:162
                      • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                        • ActionView::Helpers::Tags::Label#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                          • ActionView::Helpers::Tags::Label#tag_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:97
                            • ActionView::Helpers::Tags::Label#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                              • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:120
                            • NilClass#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:102
                      • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                        • ActionView::Helpers::Tags::Label#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                          • ActionView::Helpers::Tags::Label#tag_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:106
                            • ActionView::Helpers::Tags::Label#sanitized_object_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:115
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                              • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                            • ActionView::Helpers::Tags::Label#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                      • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:92
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:54
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:55
                  • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:56
                  • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:58
                    • ActionView::Helpers::Tags::Label::LabelBuilder#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:8
                  • Kernel#block_given? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:60
                  • NilClass#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                    • NilClass#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:52
                  • ActionView::Helpers::Tags::Label#render_component $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:73
                    • ActionView::Helpers::Tags::Label::LabelBuilder#translation $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:16
                      • NilClass#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                        • NilClass#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:52
                      • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:20
                        • ActionView::Helpers::Tags::Translator#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:5
                          • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:6
                          • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                            • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                              • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                            • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                            • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                            • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
                      • ActionView::Helpers::Tags::Translator#translate $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:12
                        • ActionView::Helpers::Tags::Translator#i18n_default $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:23
                          • Student#model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
                            • Kernel#class $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
                            • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
                          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:26
                          • String#to_sym $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:26
                        • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                          • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                            • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                          • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                          • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                          • ActionView::I18nProxy#locale $GemPath0/gems/actionview-5.0.4/lib/action_view/rendering.rb:14
                            • I18n::Config#locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:7
                              • I18n::Config#default_locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:28
                          • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                          • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                          • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                            • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                              • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                            • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                            • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                              • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                          • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                            • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                              • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                  • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                  • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                    • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                      • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                        • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                        • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                      • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                    • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                      • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                    • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                    • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                      • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                    • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                    • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                      • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                    • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                  • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                  • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                    • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                      • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                      • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                      • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                • I18n::Backend::Simple#default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:101
                                  • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                    • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                      • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                  • Hash#reject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                  • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:104
                                  • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                      • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                        • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                          • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                            • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                            • Hash#merge $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                              • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                            • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                                              • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                              • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                                              • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                                                • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                  • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                  • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                                                • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                                                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                  • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                                                  • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                                              • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                                                  • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                                    • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                                    • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                                      • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                                      • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                                        • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                          • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                                      • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                                      • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                        • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                    • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                                      • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                        • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                          • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                          • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                                    • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                    • Class#new $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                                      • I18n::MissingTranslation#initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:45
                                                        • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                          • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                            • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                        • Hash#each $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                          • I18n::MissingTranslation#block in initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                    • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                                              • I18n.handle_exception $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:308
                                                • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:313
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                      • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                        • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                          • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                            • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                            • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                  • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                    • String#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                                  • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                    • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                      • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                  • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                                    • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • I18n::Backend::Simple#interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:154
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:155
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                        • String#presence $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:41
                          • String#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                            • String#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:114
                        • ActionView::Helpers::Tags::Translator#human_attribute_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:32
                          • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:33
                          • Student.respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:3
                            • ActiveRecord::DynamicMatchers::Method.match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:31
                              • Enumerable#find $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                • Array#each $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                  • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                    • ActiveRecord::DynamicMatchers::FindBy.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                                    • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                  • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                    • ActiveRecord::DynamicMatchers::FindByBang.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                                    • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                            • Kernel#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:8
                          • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:34
                          • Student.human_attribute_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:43
                            • Hash#merge! $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:44
                            • String#to_s $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:45
                            • String#split $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:45
                            • Array#pop $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:46
                            • Student.i18n_scope $GemPath0/gems/activerecord-5.0.4/lib/active_record/translation.rb:18
                            • Symbol#to_s $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:48
                            • Student.lookup_ancestors $GemPath0/gems/activerecord-5.0.4/lib/active_record/translation.rb:6
                              • Student.base_class $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:94
                                • Module#< $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:95
                                • Class#superclass $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:99
                                • Class#superclass $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:99
                                • ApplicationRecord.abstract_class? $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:124
                            • Array#map $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:56
                              • Student.block in human_attribute_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:56
                                • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
                                • Symbol#to_s $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:57
                                • String#intern $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:57
                            • String#intern $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:61
                            • String#humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/inflections.rb:221
                              • ActiveSupport::Inflector.humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:123
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                  • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                    • String#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                                  • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                                  • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                                    • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                                      • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                                • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:126
                                • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:128
                                • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:129
                                • String#tr! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:130
                                • String#gsub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                                  • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                                    • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                                      • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                                        • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                                          • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                                    • String#downcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:133
                                  • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                                    • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                                      • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                                        • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                                          • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                                    • String#downcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:133
                                • Hash#fetch $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:136
                                • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                                  • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                                    • String#upcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                            • Array#shift $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:66
                            • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                              • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                  • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • ActionView::I18nProxy#locale $GemPath0/gems/actionview-5.0.4/lib/action_view/rendering.rb:14
                                • I18n::Config#locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:7
                                  • I18n::Config#default_locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:28
                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                              • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                                • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                  • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                  • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                                • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                  • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                                  • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                              • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                                  • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                    • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                    • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                      • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                      • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                        • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                          • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                      • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                      • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                    • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                    • I18n::Backend::Simple#default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:101
                                      • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                        • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                          • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                      • Hash#reject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                      • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:104
                                      • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                          • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                            • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                              • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                • Hash#merge $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                  • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                    • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                                                  • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                    • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                      • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                                                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                  • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                                                  • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                                                  • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                                                  • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                                                    • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                      • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                      • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                    • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                                                    • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                                                      • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                        • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                        • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                      • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                                                      • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                                                  • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                    • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                                                      • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                                        • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                                        • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                                          • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                                          • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                                            • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                              • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                                          • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                                          • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                        • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                        • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                        • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                                          • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                            • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                              • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                              • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                                        • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                                        • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                        • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                        • Class#new $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                                          • I18n::MissingTranslation#initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:45
                                                            • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                              • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                                • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                            • Hash#each $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                              • I18n::MissingTranslation#block in initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                        • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                                                  • I18n.handle_exception $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:308
                                                    • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:313
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                          • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                            • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                              • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                    • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                    • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                      • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                        • String#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                    • I18n::Backend::Simple#pluralize $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:141
                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:142
                                    • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                                      • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                        • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                          • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                      • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                                        • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                    • I18n::Backend::Simple#interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:154
                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:155
                                      • I18n.interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:14
                                        • String#=~ $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:15
                                        • Kernel#kind_of? $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:16
                                        • I18n.interpolate_hash $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:20
                                          • String#gsub $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:21
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                  • ActionView::Helpers::Tags::Label#label_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:208
                    • Kernel#block_given? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:209
                    • Hash#stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:37
                      • Hash#transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:12
                        • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:13
                        • Hash#each_key $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                          • Hash#block in transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                            • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:16
                    • String#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:114
                      • Regexp#=== $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:118
                    • Hash#has_key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:215
                    • ActionView::Helpers::Tags::Label#content_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:18
                      • ActionView::Helpers::Tags::Label#content_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:104
                        • Kernel#block_given? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:105
                        • ActionView::Helpers::Tags::Label#content_tag_string $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:144
                          • ActionView::Helpers::Tags::Label#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
                            • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
                            • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                              • ActionView::Helpers::Tags::Label#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                                • ActionView::Helpers::Tags::Label#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                                  • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                                  • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                    • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                    • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                      • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                    • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                                  • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                            • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                            • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                            • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                              • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                            • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:147
                          • ActionView::Helpers::TagHelper.block in <module:TagHelper> $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:25
                          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:147
                          • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
                            • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                              • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                                • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
                      • ActionView::Helpers::Tags::Label#error_wrapping $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:26
                        • ActionView::Helpers::Tags::Label#object_has_errors? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:40
                          • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                            • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                              • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                            • Symbol#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
                            • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                            • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                            • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                            • Class#new $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:301
                              • ActiveModel::Errors#initialize $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:72
                                • ActiveModel::Errors#apply_default_array $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:544
                                  • Kernel#proc $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                                  • Hash#default_proc= $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                                    • Proc#to_proc $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                                • ActiveModel::Errors#apply_default_array $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:544
                                  • Kernel#proc $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                                  • Hash#default_proc= $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                                    • Proc#to_proc $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                          • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:41
                          • ActionView::Helpers::Tags::Label#error_message $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:34
                            • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                            • ActiveModel::Errors#[] $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:172
                              • String#to_sym $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:173
                              • ActiveModel::Errors#block in apply_default_array $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                          • Array#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                            • Array#empty? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:22
            • ActionView::OutputBuffer#<< $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:10
              • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:11
              • ActiveSupport::SafeBuffer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:216
              • ActionView::OutputBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
                • ActionView::OutputBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
                  • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                  • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
            • ActionView::OutputBuffer#safe_concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:169
              • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:171
            • ActionView::Helpers::FormBuilder#text_field $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1301
              • ActionView::Helpers::FormBuilder#objectify_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1867
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
              • #<Class:0x007f4a31e7cca0>#text_field $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:792
                • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:793
                  • ActionView::Helpers::Tags::TextField#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/placeholderable.rb:5
                    • ActionView::Helpers::Tags::TextField#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:10
                      • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:15
                      • ActionView::Helpers::Tags::TextField#retrieve_object $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:55
                      • #<Class:Regexp>#last_match $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:18
                • ActionView::Helpers::Tags::TextField#render $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:9
                  • Hash#stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:37
                    • Hash#transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:12
                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:13
                      • Hash#each_key $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                  • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:11
                  • ActionView::Helpers::Tags::TextField#field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:26
                    • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:27
                    • ActionView::Helpers::Tags::TextField.field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:19
                  • ActionView::Helpers::Tags::TextField#field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:26
                    • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:27
                    • ActionView::Helpers::Tags::TextField.field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:19
                  • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:13
                    • ActionView::Helpers::Tags::TextField#block in render $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:13
                      • ActionView::Helpers::Tags::TextField#value_before_type_cast $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:38
                        • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:39
                        • ActionView::Helpers::Tags::TextField#value_came_from_user? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:50
                          • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                            • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                              • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                            • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
                            • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                            • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                            • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Kernel#public_send $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:52
                            • Student#name_came_from_user? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:384
                              • Student#attribute_came_from_user? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/before_type_cast.rb:71
                                • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:11
                                  • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:41
                                    • ActiveRecord::LazyAttributeHash#assign_default_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:118
                                      • Hash#fetch $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:119
                                      • Hash#fetch $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:121
                                      • ActiveRecord::Attribute.from_database $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:4
                                        • Class#new $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:5
                                          • ActiveRecord::Attribute::FromDatabase#initialize $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:29
                                • ActiveRecord::Attribute::FromDatabase#came_from_user? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:91
                        • ActionView::Helpers::Tags::TextField#value $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:34
                          • Kernel#public_send $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:35
                            • Student#__temp__e616d656 $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:34
                              • Student#_read_attribute $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:65
                                • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:66
                                • ActiveRecord::AttributeSet#fetch_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:43
                                  • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:11
                                    • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:41
                                  • ActiveRecord::Attribute::FromDatabase#value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:36
                                    • ActiveRecord::Attribute::FromDatabase#type_cast $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:139
                                      • ActiveModel::Type::String#deserialize $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/value.rb:21
                                        • ActiveModel::Type::String#cast $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/value.rb:35
                                          • Kernel#nil? $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/value.rb:36
                                          • ActiveModel::Type::String#cast_value $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:14
                                            • Module#=== $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:16
                                            • Class#new $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:16
                                              • String#initialize $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/string.rb:16
                  • ActionView::Helpers::Tags::TextField#add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:88
                    • ActionView::Helpers::Tags::TextField#name_and_id_index $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:161
                      • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:162
                    • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                      • ActionView::Helpers::Tags::TextField#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                        • ActionView::Helpers::Tags::TextField#tag_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:97
                          • ActionView::Helpers::Tags::TextField#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                            • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:120
                          • NilClass#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:102
                    • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                      • ActionView::Helpers::Tags::TextField#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                        • ActionView::Helpers::Tags::TextField#tag_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:106
                          • ActionView::Helpers::Tags::TextField#sanitized_object_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:115
                            • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                            • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                          • ActionView::Helpers::Tags::TextField#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                    • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:92
                  • ActionView::Helpers::Tags::TextField#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:22
                    • ActionView::Helpers::Tags::TextField#tag_generate_errors? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:44
                    • ActionView::Helpers::Tags::TextField#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:75
                      • ActionView::Helpers::Tags::TextField#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
                        • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
                        • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • NilClass#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
                        • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                          • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                            • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
                    • ActionView::Helpers::Tags::TextField#error_wrapping $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:26
                      • ActionView::Helpers::Tags::TextField#object_has_errors? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:40
                        • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                          • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                            • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                          • Symbol#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
                          • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                          • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                        • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                        • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:41
                        • ActionView::Helpers::Tags::TextField#error_message $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:34
                          • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                          • ActiveModel::Errors#[] $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:172
                            • String#to_sym $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:173
                        • Array#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                          • Array#empty? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:22
            • ActionView::OutputBuffer#<< $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:10
              • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:11
              • ActiveSupport::SafeBuffer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:216
              • ActionView::OutputBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
                • ActionView::OutputBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
                  • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                  • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
            • ActionView::OutputBuffer#safe_concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:169
              • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:171
            • ActionView::Helpers::FormBuilder#label $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1637
              • ActionView::Helpers::FormBuilder#objectify_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1867
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
              • #<Class:0x007f4a31e7cca0>#label $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:771
                • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:772
                  • ActionView::Helpers::Tags::Label#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:28
                    • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:31
                    • ActionView::Helpers::Tags::Label#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:10
                      • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:15
                      • ActionView::Helpers::Tags::Label#retrieve_object $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:55
                      • #<Class:Regexp>#last_match $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:18
                • ActionView::Helpers::Tags::Label#render $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:42
                  • Hash#stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:37
                    • Hash#transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:12
                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:13
                      • Hash#each_key $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:44
                  • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:45
                    • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:45
                      • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:45
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:50
                  • ActionView::Helpers::Tags::Label#add_default_name_and_id_for_value $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:75
                    • NilClass#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:76
                    • ActionView::Helpers::Tags::Label#add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:88
                      • ActionView::Helpers::Tags::Label#name_and_id_index $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:161
                        • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:162
                      • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                        • ActionView::Helpers::Tags::Label#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                          • ActionView::Helpers::Tags::Label#tag_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:97
                            • ActionView::Helpers::Tags::Label#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                              • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:120
                            • NilClass#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:102
                      • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                        • ActionView::Helpers::Tags::Label#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                          • ActionView::Helpers::Tags::Label#tag_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:106
                            • ActionView::Helpers::Tags::Label#sanitized_object_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:115
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                              • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                            • ActionView::Helpers::Tags::Label#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                      • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:92
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:54
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:55
                  • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:56
                  • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:58
                    • ActionView::Helpers::Tags::Label::LabelBuilder#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:8
                  • Kernel#block_given? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:60
                  • NilClass#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                    • NilClass#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:52
                  • ActionView::Helpers::Tags::Label#render_component $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:73
                    • ActionView::Helpers::Tags::Label::LabelBuilder#translation $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:16
                      • NilClass#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                        • NilClass#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:52
                      • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/label.rb:20
                        • ActionView::Helpers::Tags::Translator#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:5
                          • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:6
                          • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                            • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                              • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                            • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                            • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                            • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
                      • ActionView::Helpers::Tags::Translator#translate $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:12
                        • ActionView::Helpers::Tags::Translator#i18n_default $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:23
                          • Student#model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
                            • Kernel#class $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
                            • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
                          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:26
                          • String#to_sym $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:26
                        • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                          • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                            • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                          • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                          • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                          • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                          • ActionView::I18nProxy#locale $GemPath0/gems/actionview-5.0.4/lib/action_view/rendering.rb:14
                            • I18n::Config#locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:7
                              • I18n::Config#default_locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:28
                          • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                          • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                          • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                            • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                              • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                            • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                            • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                              • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                          • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                            • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                              • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                  • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                  • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                    • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                      • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                        • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                        • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                      • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                    • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                      • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                    • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                    • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                      • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                    • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                    • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                      • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                    • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                  • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                  • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                    • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                      • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                      • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                      • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                        • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                • I18n::Backend::Simple#default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:101
                                  • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                    • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                      • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                  • Hash#reject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                  • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:104
                                  • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                      • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                        • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                          • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                            • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                            • Hash#merge $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                              • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                            • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                                              • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                              • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                              • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                                              • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                                                • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                  • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                  • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                                                • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                                                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                  • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                                                  • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                                              • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                                                  • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                                    • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                                    • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                                      • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                                      • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                                        • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                          • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                                      • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                                      • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                        • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                    • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                                      • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                        • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                          • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                          • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                                    • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                    • Class#new $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                                      • I18n::MissingTranslation#initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:45
                                                        • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                          • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                            • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                        • Hash#each $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                          • I18n::MissingTranslation#block in initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                    • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                                              • I18n.handle_exception $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:308
                                                • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:313
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                    • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                      • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                        • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                          • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                            • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                            • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                  • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                    • String#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                                  • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                    • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                      • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                  • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                                    • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                      • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                        • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • I18n::Backend::Simple#interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:154
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:155
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                        • String#presence $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:41
                          • String#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                            • String#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:114
                        • ActionView::Helpers::Tags::Translator#human_attribute_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:32
                          • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:33
                          • Student.respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:3
                            • ActiveRecord::DynamicMatchers::Method.match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:31
                              • Enumerable#find $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                • Array#each $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                  • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                    • ActiveRecord::DynamicMatchers::FindBy.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                                    • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                  • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                                    • ActiveRecord::DynamicMatchers::FindByBang.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                                    • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                            • Kernel#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:8
                          • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/translator.rb:34
                          • Student.human_attribute_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:43
                            • Hash#merge! $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:44
                            • String#to_s $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:45
                            • String#split $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:45
                            • Array#pop $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:46
                            • Student.i18n_scope $GemPath0/gems/activerecord-5.0.4/lib/active_record/translation.rb:18
                            • Symbol#to_s $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:48
                            • Student.lookup_ancestors $GemPath0/gems/activerecord-5.0.4/lib/active_record/translation.rb:6
                              • Student.base_class $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:94
                                • Module#< $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:95
                                • Class#superclass $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:99
                                • Class#superclass $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:99
                                • ApplicationRecord.abstract_class? $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:124
                            • Array#map $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:56
                              • Student.block in human_attribute_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:56
                                • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
                                • Symbol#to_s $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:57
                                • String#intern $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:57
                            • String#intern $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:61
                            • String#humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/inflections.rb:221
                              • ActiveSupport::Inflector.humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:123
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                  • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                    • String#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                                • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                                  • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                                  • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                                    • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                                      • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                                • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:126
                                • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:128
                                • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:129
                                • String#tr! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:130
                                • String#gsub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                                  • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                                    • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                                      • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                                        • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                                          • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                                    • String#downcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:133
                                  • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                                    • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                                      • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                                        • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                                          • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                                    • String#downcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:133
                                • Hash#fetch $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:136
                                • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                                  • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                                    • String#upcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                            • Array#shift $GemPath0/gems/activemodel-5.0.4/lib/active_model/translation.rb:66
                            • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                              • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                  • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                              • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • ActionView::I18nProxy#locale $GemPath0/gems/actionview-5.0.4/lib/action_view/rendering.rb:14
                                • I18n::Config#locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:7
                                  • I18n::Config#default_locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:28
                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                              • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                              • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                                • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                  • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                  • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                                • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                  • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                                  • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                              • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                                  • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                    • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                    • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                      • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                      • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                        • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                          • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                        • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                          • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                        • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                      • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                      • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                        • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                          • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                            • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                            • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                    • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                    • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                    • I18n::Backend::Simple#default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:101
                                      • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                        • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                          • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                      • Hash#reject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                      • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:104
                                      • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                          • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                            • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                              • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                • Hash#merge $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                  • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                    • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                                • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                                                  • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                    • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                      • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                                  • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                                                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                  • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                                                  • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                                                  • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                                                  • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                                                    • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                      • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                      • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                    • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                                                    • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                                                      • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                        • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                        • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                      • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                                                      • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                                                  • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                    • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                                                      • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                                        • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                                        • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                                          • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                                          • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                                            • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                              • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                                          • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                                          • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                            • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                        • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                        • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                                        • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                                          • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                            • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                              • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                              • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                                        • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                                        • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                        • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:35
                                                        • Class#new $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                                          • I18n::MissingTranslation#initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:45
                                                            • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                              • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                                • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:46
                                                            • Hash#each $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                              • I18n::MissingTranslation#block in initialize $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/exceptions.rb:47
                                                        • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:36
                                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                                                  • I18n.handle_exception $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:308
                                                    • Kernel#throw $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:313
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                        • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                          • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                            • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                              • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                    • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                    • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                      • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                        • String#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                    • I18n::Backend::Simple#pluralize $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:141
                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:142
                                    • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                                      • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                        • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                          • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                      • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                                        • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                          • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                    • I18n::Backend::Simple#interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:154
                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:155
                                      • I18n.interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:14
                                        • String#=~ $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:15
                                        • Kernel#kind_of? $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:16
                                        • I18n.interpolate_hash $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:20
                                          • String#gsub $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:21
                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                  • ActionView::Helpers::Tags::Label#label_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:208
                    • Kernel#block_given? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:209
                    • Hash#stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:37
                      • Hash#transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:12
                        • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:13
                        • Hash#each_key $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                          • Hash#block in transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                            • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:16
                    • String#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:114
                      • Regexp#=== $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:118
                    • Hash#has_key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:215
                    • ActionView::Helpers::Tags::Label#content_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:18
                      • ActionView::Helpers::Tags::Label#content_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:104
                        • Kernel#block_given? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:105
                        • ActionView::Helpers::Tags::Label#content_tag_string $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:144
                          • ActionView::Helpers::Tags::Label#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
                            • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
                            • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                              • ActionView::Helpers::Tags::Label#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                                • ActionView::Helpers::Tags::Label#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                                  • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                                  • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                    • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                    • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                      • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                    • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                                  • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                            • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                            • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                            • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                              • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                            • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:147
                          • ActionView::Helpers::TagHelper.block in <module:TagHelper> $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:25
                          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:147
                          • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
                            • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                              • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                                • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
                      • ActionView::Helpers::Tags::Label#error_wrapping $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:26
                        • ActionView::Helpers::Tags::Label#object_has_errors? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:40
                          • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                            • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                              • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                            • Symbol#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
                            • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                            • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                            • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                          • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:41
                          • ActionView::Helpers::Tags::Label#error_message $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:34
                            • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                            • ActiveModel::Errors#[] $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:172
                              • String#to_sym $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:173
                              • ActiveModel::Errors#block in apply_default_array $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:545
                          • Array#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                            • Array#empty? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:22
            • ActionView::OutputBuffer#<< $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:10
              • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:11
              • ActiveSupport::SafeBuffer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:216
              • ActionView::OutputBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
                • ActionView::OutputBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
                  • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                  • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
            • ActionView::OutputBuffer#safe_concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:169
              • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:171
            • ActionView::Helpers::FormBuilder#text_field $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1301
              • ActionView::Helpers::FormBuilder#objectify_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1867
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                • Hash#merge $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                  • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
                    • Hash#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1868
              • #<Class:0x007f4a31e7cca0>#text_field $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:792
                • Class#new $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:793
                  • ActionView::Helpers::Tags::TextField#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/placeholderable.rb:5
                    • ActionView::Helpers::Tags::TextField#initialize $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:10
                      • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • Kernel#dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                        • Kernel#initialize_dup $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                          • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:11
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • String#sub! $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:14
                      • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:15
                      • ActionView::Helpers::Tags::TextField#retrieve_object $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:55
                      • #<Class:Regexp>#last_match $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:18
                • ActionView::Helpers::Tags::TextField#render $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:9
                  • Hash#stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:37
                    • Hash#transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:12
                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:13
                      • Hash#each_key $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
                  • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:11
                  • ActionView::Helpers::Tags::TextField#field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:26
                    • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:27
                    • ActionView::Helpers::Tags::TextField.field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:19
                  • ActionView::Helpers::Tags::TextField#field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:26
                    • Kernel#class $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:27
                    • ActionView::Helpers::Tags::TextField.field_type $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:19
                  • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:13
                    • ActionView::Helpers::Tags::TextField#block in render $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/text_field.rb:13
                      • ActionView::Helpers::Tags::TextField#value_before_type_cast $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:38
                        • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:39
                        • ActionView::Helpers::Tags::TextField#value_came_from_user? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:50
                          • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                            • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                              • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                            • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
                            • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                            • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                            • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Kernel#public_send $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:52
                            • Student#grade_came_from_user? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:384
                              • Student#attribute_came_from_user? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/before_type_cast.rb:71
                                • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:11
                                  • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:41
                                    • ActiveRecord::LazyAttributeHash#assign_default_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:118
                                      • Hash#fetch $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:119
                                      • Hash#fetch $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:121
                                      • ActiveRecord::Attribute.from_database $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:4
                                        • Class#new $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:5
                                          • ActiveRecord::Attribute::FromDatabase#initialize $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:29
                                • ActiveRecord::Attribute::FromDatabase#came_from_user? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:91
                        • ActionView::Helpers::Tags::TextField#value $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:34
                          • Kernel#public_send $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:35
                            • Student#__temp__7627164656 $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:34
                              • Student#_read_attribute $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:65
                                • String#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods/read.rb:66
                                • ActiveRecord::AttributeSet#fetch_value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:43
                                  • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set.rb:11
                                    • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_set/builder.rb:41
                                  • ActiveRecord::Attribute::FromDatabase#value $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:36
                                    • ActiveRecord::Attribute::FromDatabase#type_cast $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute.rb:139
                                      • ActiveModel::Type::Integer#deserialize $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/integer.rb:19
                                        • Kernel#nil? $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/integer.rb:20
                                        • Integer#to_i $GemPath0/gems/activemodel-5.0.4/lib/active_model/type/integer.rb:21
                  • ActionView::Helpers::Tags::TextField#add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:88
                    • ActionView::Helpers::Tags::TextField#name_and_id_index $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:161
                      • Hash#key? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:162
                    • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                      • ActionView::Helpers::Tags::TextField#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:90
                        • ActionView::Helpers::Tags::TextField#tag_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:97
                          • ActionView::Helpers::Tags::TextField#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                            • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:120
                          • NilClass#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:102
                    • Hash#fetch $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                      • ActionView::Helpers::Tags::TextField#block in add_default_name_and_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:91
                        • ActionView::Helpers::Tags::TextField#tag_id $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:106
                          • ActionView::Helpers::Tags::TextField#sanitized_object_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:115
                            • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                            • String#sub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:116
                          • ActionView::Helpers::Tags::TextField#sanitized_method_name $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:119
                    • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tags/base.rb:92
                  • ActionView::Helpers::Tags::TextField#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:22
                    • ActionView::Helpers::Tags::TextField#tag_generate_errors? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:44
                    • ActionView::Helpers::Tags::TextField#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:75
                      • ActionView::Helpers::Tags::TextField#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
                        • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
                        • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • NilClass#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • Integer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/numeric/conversions.rb:103
                                  • NilClass#=== $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/numeric/conversions.rb:105
                                  • Integer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/numeric/conversions.rb:106
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                          • ActionView::Helpers::Tags::TextField#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                            • ActionView::Helpers::Tags::TextField#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                              • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                  • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                              • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
                        • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                          • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                            • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
                    • ActionView::Helpers::Tags::TextField#error_wrapping $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:26
                      • ActionView::Helpers::Tags::TextField#object_has_errors? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:40
                        • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                          • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                            • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                          • Symbol#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
                          • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                          • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                          • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                        • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                        • Kernel#respond_to? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:41
                        • ActionView::Helpers::Tags::TextField#error_message $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/active_model_helper.rb:34
                          • Student#errors $GemPath0/gems/activemodel-5.0.4/lib/active_model/validations.rb:300
                          • ActiveModel::Errors#[] $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:172
                            • String#to_sym $GemPath0/gems/activemodel-5.0.4/lib/active_model/errors.rb:173
                        • Array#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
                          • Array#empty? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:22
            • ActionView::OutputBuffer#<< $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:10
              • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:11
              • ActiveSupport::SafeBuffer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:216
              • ActionView::OutputBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
                • ActionView::OutputBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
                  • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                  • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
            • ActionView::OutputBuffer#safe_concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:169
              • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:171
            • ActionView::Helpers::FormBuilder#submit $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1812
              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1813
              • ActionView::Helpers::FormBuilder#submit_default_value $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1871
                • ActionView::Helpers::FormBuilder#convert_to_model $GemPath0/gems/actionview-5.0.4/lib/action_view/model_naming.rb:4
                  • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                    • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                      • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                    • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                    • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                    • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                  • Student#to_model $GemPath0/gems/activemodel-5.0.4/lib/active_model/conversion.rb:39
                • Student#persisted? $GemPath0/gems/activerecord-5.0.4/lib/active_record/persistence.rb:98
                  • Student#sync_with_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:498
                    • Student#update_attributes_from_transaction_state $GemPath0/gems/activerecord-5.0.4/lib/active_record/transactions.rb:502
                • Student#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:219
                  • Student#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:449
                    • Kernel#respond_to? $GemPath0/gems/activemodel-5.0.4/lib/active_model/attribute_methods.rb:450
                  • Symbol#to_s $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:228
                  • Kernel#class $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                  • Student.column_names $GemPath0/gems/activerecord-5.0.4/lib/active_record/model_schema.rb:388
                  • Array#include? $GemPath0/gems/activerecord-5.0.4/lib/active_record/attribute_methods.rb:235
                • Student#model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
                  • Kernel#class $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:221
                  • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
                • ActiveModel::Name#human $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:177
                  • Student.respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:3
                    • ActiveRecord::DynamicMatchers::Method.match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:31
                      • Enumerable#find $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                        • Array#each $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                          • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                            • ActiveRecord::DynamicMatchers::FindBy.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                            • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                          • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                            • ActiveRecord::DynamicMatchers::FindByBang.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                            • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                    • Kernel#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:8
                  • Student.respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:3
                    • ActiveRecord::DynamicMatchers::Method.match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:31
                      • Enumerable#find $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                        • Array#each $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                          • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                            • ActiveRecord::DynamicMatchers::FindBy.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                            • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                          • ActiveRecord::DynamicMatchers::Method.block in match $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                            • ActiveRecord::DynamicMatchers::FindByBang.pattern $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:36
                            • Symbol#=~ $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:32
                    • Kernel#respond_to? $GemPath0/gems/activerecord-5.0.4/lib/active_record/dynamic_matchers.rb:8
                  • Student.lookup_ancestors $GemPath0/gems/activerecord-5.0.4/lib/active_record/translation.rb:6
                    • Student.base_class $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:94
                      • Module#< $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:95
                      • Class#superclass $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:99
                      • Class#superclass $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:99
                      • ApplicationRecord.abstract_class? $GemPath0/gems/activerecord-5.0.4/lib/active_record/inheritance.rb:124
                  • Array#map $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:181
                    • ActiveModel::Name#block in human $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:181
                      • Student.model_name $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:236
                  • Student.i18n_scope $GemPath0/gems/activerecord-5.0.4/lib/active_record/translation.rb:18
                  • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                    • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                      • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                        • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                    • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                      • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                        • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                          • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                  • Hash#merge! $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:188
                  • Array#shift $GemPath0/gems/activemodel-5.0.4/lib/active_model/naming.rb:189
                  • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                    • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                    • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                    • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                      • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                        • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                    • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                    • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                      • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                      • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                    • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                    • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                    • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                      • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                      • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                    • ActionView::I18nProxy#locale $GemPath0/gems/actionview-5.0.4/lib/action_view/rendering.rb:14
                      • I18n::Config#locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:7
                        • I18n::Config#default_locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:28
                    • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                    • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                    • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                      • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                        • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                        • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                      • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                      • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                        • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                          • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                          • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                        • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                    • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                      • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                        • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                          • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                          • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                            • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                            • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                              • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                  • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                  • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                              • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                              • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                              • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                • Array#hash $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:325
                                  • Kernel#hash $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:325
                                  • Kernel#hash $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:325
                                • Array#eql? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:325
                                  • Kernel#eql? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:325
                                  • Kernel#eql? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:325
                              • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                              • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                              • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                            • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                            • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                              • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                  • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                  • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                  • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                  • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                  • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                  • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                          • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                          • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                          • I18n::Backend::Simple#default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:101
                            • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                              • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                                • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                            • Hash#reject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                              • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                              • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                              • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                            • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:104
                            • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                              • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                                • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                  • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                    • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                      • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                      • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                          • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                          • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                            • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                              • String#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                          • I18n::Backend::Simple#pluralize $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:141
                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:142
                          • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                            • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                              • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                            • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                              • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                  • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                          • I18n::Backend::Simple#interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:154
                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:155
                            • I18n.interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:14
                              • String#=~ $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:15
                              • Kernel#kind_of? $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:16
                              • I18n.interpolate_hash $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:20
                                • String#gsub $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:21
                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1882
                • String#intern $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1882
                • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1883
                • String#intern $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1883
                • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1884
                • String#humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/inflections.rb:221
                  • ActiveSupport::Inflector.humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:123
                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                    • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                      • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                        • String#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:124
                    • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                      • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                      • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                        • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                          • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                    • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:126
                    • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:128
                    • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:129
                    • String#tr! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:130
                    • String#gsub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                      • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                        • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                          • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                          • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                            • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                              • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                        • String#downcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:133
                      • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:132
                        • ActiveSupport::Inflector.inflections $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:234
                          • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:235
                          • ActiveSupport::Inflector::Inflections.instance $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/inflections.rb:61
                            • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/map.rb:92
                              • Concurrent::Map#[] $GemPath0/gems/concurrent-ruby-1.0.5/lib/concurrent/collection/map/non_concurrent_map_backend.rb:19
                        • String#downcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:133
                    • Hash#fetch $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:136
                    • String#sub! $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                      • ActiveSupport::Inflector.block in humanize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                        • String#upcase $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:137
                • Array#shift $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_helper.rb:1886
                • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                  • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                  • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                  • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                    • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                      • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                  • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                  • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                  • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                  • ActionView::I18nProxy#locale $GemPath0/gems/actionview-5.0.4/lib/action_view/rendering.rb:14
                    • I18n::Config#locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:7
                      • I18n::Config#default_locale $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:28
                  • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                  • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                  • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                    • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                      • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                      • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                    • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                    • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                      • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                        • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                        • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                      • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                      • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                  • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                    • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                      • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                        • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                        • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                          • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                          • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                            • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                              • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                              • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                            • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                              • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                            • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                          • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                          • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                            • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                              • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                        • NilClass#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                        • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                        • I18n::Backend::Simple#default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:101
                          • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                            • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                              • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                          • Hash#reject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                            • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                            • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:102
                          • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:104
                          • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                            • I18n::Backend::Simple#block in default $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:105
                              • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                  • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                    • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                    • Hash#merge $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                      • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                        • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:122
                                    • I18n.translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:144
                                      • Array#last $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                      • Array#pop $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                      • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                        • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                          • Hash#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:145
                                      • Array#shift $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:146
                                      • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                        • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                        • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                      • ActionView::I18nProxy#backend $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:18
                                      • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:148
                                      • Hash#delete $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:149
                                      • I18n.enforce_available_locales! $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:282
                                        • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                          • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                          • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                        • ActionView::I18nProxy#enforce_available_locales $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:134
                                        • I18n.locale_available? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:277
                                          • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                            • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                            • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                          • ActionView::I18nProxy#available_locales_set $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:48
                                          • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:152
                                      • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                        • I18n.block in translate $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:154
                                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:155
                                          • I18n::Backend::Simple#translate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:24
                                            • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:26
                                            • I18n::Backend::Simple#lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:70
                                              • I18n::Backend::Simple#initialized? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:23
                                              • I18n.normalize_keys $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:265
                                                • I18n.default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:30
                                                  • I18n.config $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:17
                                                    • #<Class:Thread>#current $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                    • Thread#[] $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:18
                                                  • ActionView::I18nProxy#default_separator $GemPath0/gems/i18n-0.8.4/lib/i18n/config.rb:68
                                                • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                  • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:269
                                                • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                  • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:270
                                                • I18n.normalize_key $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:324
                                                  • I18n.normalized_key_cache $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:337
                                                • Array#concat $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:271
                                              • I18n::Backend::Simple#translations $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:61
                                              • Enumerable#inject $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                • Array#each $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                  • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                    • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                  • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                    • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                  • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                    • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                                  • I18n::Backend::Simple#block in lookup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:74
                                                    • Symbol#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:75
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Hash#has_key? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:76
                                                    • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/simple.rb:78
                                            • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:28
                                            • I18n::Backend::Simple#resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:117
                                              • Kernel#catch $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                • I18n::Backend::Simple#block in resolve $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:119
                                                  • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:121
                                                  • Module#=== $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:123
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                                            • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                                            • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                            • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                              • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                                • String#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                                            • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                                              • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                                • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                                  • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                                              • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                                                • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                  • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                                    • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                            • I18n::Backend::Simple#interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:154
                                              • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:155
                                              • I18n.interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:14
                                                • String#=~ $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:15
                                                • Kernel#kind_of? $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:16
                                                • I18n.interpolate_hash $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:20
                                                  • String#gsub $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:21
                                                    • I18n.block in interpolate_hash $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:21
                                                      • String#to_sym $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:25
                                                      • Hash#key? $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:26
                                                      • Kernel#respond_to? $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:31
                                      • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
                                • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:130
                        • Kernel#nil? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:34
                        • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                        • Kernel#dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                          • Kernel#initialize_dup $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                            • String#initialize_copy $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:40
                        • Hash#except $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:10
                          • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                            • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                              • Hash#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:11
                          • Hash#except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:18
                            • Array#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                              • Hash#block in except! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                                • Hash#delete $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/except.rb:19
                        • I18n::Backend::Simple#interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:154
                          • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n/backend/base.rb:155
                          • I18n.interpolate $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:14
                            • String#=~ $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:15
                            • Kernel#kind_of? $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:16
                            • I18n.interpolate_hash $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:20
                              • String#gsub $GemPath0/gems/i18n-0.8.4/lib/i18n/interpolate/ruby.rb:21
                  • Kernel#is_a? $GemPath0/gems/i18n-0.8.4/lib/i18n.rb:161
              • #<Class:0x007f4a31e7cca0>#submit_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:444
                • Hash#deep_stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:111
                  • Hash#deep_transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:92
                    • Hash#_deep_transform_keys_in_object $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:143
                      • Module#=== $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:145
                      • Enumerable#each_with_object $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:146
                        • Hash#each $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:146
                • Hash#update $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:446
                • #<Class:0x007f4a31e7cca0>#set_default_disable_with $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:889
                  • ActionView::Base.automatically_disable_submit_tag $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/module/attribute_accessors.rb:60
                  • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:896
                  • Kernel#clone $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:896
                    • Kernel#initialize_clone $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:896
                      • String#initialize_copy $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:896
                  • Hash#deep_merge! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/deep_merge.rb:21
                    • Hash#each_pair $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/deep_merge.rb:22
                      • Hash#block in deep_merge! $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/deep_merge.rb:22
                        • Kernel#is_a? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/deep_merge.rb:25
                        • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/deep_merge.rb:28
                  • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:902
                • #<Class:0x007f4a31e7cca0>#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:75
                  • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:76
                  • #<Class:0x007f4a31e7cca0>#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
                    • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
                    • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                      • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                        • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                        • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                          • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                          • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                            • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                            • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                            • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                              • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                            • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                          • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                        • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                        • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                          • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                          • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                            • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                            • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                            • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                              • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                            • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                          • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                        • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                        • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                          • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                          • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                            • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                            • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                            • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                              • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                            • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                          • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                        • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                        • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:155
                        • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:156
                          • #<Class:0x007f4a31e7cca0>#block (2 levels) in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:156
                            • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:157
                            • #<Class:0x007f4a31e7cca0>#prefix_tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:174
                              • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:175
                              • String#dasherize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/inflections.rb:125
                                • ActiveSupport::Inflector.dasherize $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:194
                                  • String#tr $GemPath0/gems/activesupport-5.0.4/lib/active_support/inflector/methods.rb:195
                              • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:176
                              • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                                • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                                • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                                  • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                                  • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                                  • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                                    • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                                  • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                                • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                  • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
                    • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                      • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                        • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
            • ActionView::OutputBuffer#<< $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:10
              • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/buffers.rb:11
              • ActiveSupport::SafeBuffer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:216
              • ActionView::OutputBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
                • ActionView::OutputBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
                  • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                  • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
            • ActionView::OutputBuffer#safe_concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:169
              • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:171
      • ActionView::OutputBuffer#presence $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:41
        • ActionView::OutputBuffer#present? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:21
          • ActionView::OutputBuffer#blank? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:114
            • String#empty? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:118
            • Regexp#=== $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/object/blank.rb:118
      • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/capture_helper.rb:40
      • ERB::Util.html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:19
        • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
          • ActionView::OutputBuffer#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:216
          • ActionView::OutputBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
        • ActionView::OutputBuffer#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
          • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
            • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
              • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
    • #<Class:0x007f4a31e7cca0>#html_options_for_form $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:821
      • Hash#stringify_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:37
        • Hash#transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:12
          • Kernel#block_given? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:13
          • Hash#each_key $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
            • Hash#block in transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
              • Symbol#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:16
            • Hash#block in transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
              • Symbol#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:16
            • Hash#block in transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
              • Symbol#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:16
            • Hash#block in transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
              • Symbol#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:16
            • Hash#block in transform_keys $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:15
              • Symbol#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/hash/keys.rb:16
      • Kernel#tap $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:822
        • #<Class:0x007f4a31e7cca0>#block in html_options_for_form $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:822
          • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:823
          • #<Class:0x007f4a31e7cca0>#url_for $GemPath0/gems/actionview-5.0.4/lib/action_view/routing_url_for.rb:78
            • Module#=== $GemPath0/gems/actionview-5.0.4/lib/action_view/routing_url_for.rb:80
          • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:829
    • #<Class:0x007f4a31e7cca0>#form_tag_with_body $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:878
      • #<Class:0x007f4a31e7cca0>#form_tag_html $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:873
        • #<Class:0x007f4a31e7cca0>#extra_tags_for_form $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:844
          • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:845
          • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:846
          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:846
          • String#downcase $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:846
          • #<Class:0x007f4a31e7cca0>#method_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/url_helper.rb:598
            • String#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/url_helper.rb:599
            • #<Class:0x007f4a31e7cca0>#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:75
              • #<Class:0x007f4a31e7cca0>#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
                • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
                • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                  • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                    • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                      • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                      • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                        • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                        • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                        • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                          • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                        • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                  • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                    • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                      • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                      • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                        • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                        • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                        • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                          • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                        • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                  • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                    • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                      • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                      • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                        • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                        • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                        • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                          • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                        • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
              • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
                • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                  • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                    • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
          • #<Class:0x007f4a31e7cca0>#token_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/url_helper.rb:589
            • #<Class:0x007f4a31e7cca0>#protect_against_forgery? $GemPath0/gems/actionpack-5.0.4/lib/abstract_controller/helpers.rb:67
              • StudentsController#protect_against_forgery? $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:392
                • StudentsController#allow_forgery_protection $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:112
                  • StudentsController#config $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:143
                  • #<Class:0x007f4a3027cfc8>#allow_forgery_protection $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:20
                    • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:20
                      • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                        • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                          • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                            • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                              • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                                • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
            • #<Class:0x007f4a31e7cca0>#form_authenticity_token $GemPath0/gems/actionpack-5.0.4/lib/abstract_controller/helpers.rb:67
              • StudentsController#form_authenticity_token $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:284
                • StudentsController#session $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal.rb:148
                  • ActionDispatch::Request#session $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:144
                    • ActionDispatch::Request#fetch_header $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:56
                      • Hash#fetch $GemPath0/gems/rack-2.0.3/lib/rack/request.rb:57
                • StudentsController#masked_authenticity_token $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:291
                  • Hash#values_at $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:292
                  • StudentsController#per_form_csrf_tokens $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:112
                    • StudentsController#config $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:143
                    • #<Class:0x007f4a3027cfc8>#per_form_csrf_tokens $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:20
                      • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:20
                        • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                          • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                            • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                              • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                                • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                                  • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                  • StudentsController#normalize_action_path $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:407
                    • URI.parse /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/common.rb:230
                      • URI::RFC3986_Parser#parse /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:71
                        • URI::RFC3986_Parser#split /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:14
                          • String#to_str /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:16
                          • String#ascii_only? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:20
                          • Regexp#match /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:22
                          • Regexp#match /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:52
                          • MatchData#[] /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:54
                          • MatchData#[] /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:55
                          • MatchData#[] /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:56
                          • MatchData#[] /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:58
                          • MatchData#[] /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:59
                          • MatchData#[] /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:63
                          • MatchData#[] /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:64
                        • URI.scheme_list /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/common.rb:140
                        • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/rfc3986_parser.rb:80
                          • URI::Generic#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:168
                            • URI::Generic#set_scheme /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:332
                            • URI::Generic#set_userinfo /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:513
                              • URI::Generic#split_userinfo /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:546
                            • URI::Generic#set_host /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:607
                            • URI::Generic#set_port /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:699
                            • URI::Generic#set_path /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:788
                            • URI::Generic#query= /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:842
                            • URI::Generic#set_opaque /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:885
                            • URI::Generic#fragment= /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:933
                            • URI::Generic#default_port /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:38
                              • Kernel#class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:39
                              • URI::Generic.default_port /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:31
                    • String#chomp $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:409
                  • StudentsController#per_form_csrf_token $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:372
                    • Class#new $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:374
                      • OpenSSL::Digest::SHA256#initialize -> block (3 levels) in <class:Digest> /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/openssl/digest.rb:43
                        • OpenSSL::Digest::SHA256#block (3 levels) in <class:Digest> /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/openssl/digest.rb:43
                          • OpenSSL::Digest#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/openssl/digest.rb:43
                    • StudentsController#real_csrf_token $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:367
                      • ActionDispatch::Request::Session#[] $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:89
                        • ActionDispatch::Request::Session#load_for_read! $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:207
                          • ActionDispatch::Request::Session#loaded? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:187
                        • Symbol#to_s $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:91
                      • ActionDispatch::Request::Session#[] $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:89
                        • ActionDispatch::Request::Session#load_for_read! $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:207
                          • ActionDispatch::Request::Session#loaded? $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:187
                        • Symbol#to_s $GemPath0/gems/actionpack-5.0.4/lib/action_dispatch/request/session.rb:91
                      • Base64.strict_decode64 /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/base64.rb:73
                        • String#unpack /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/base64.rb:74
                        • Array#first /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/base64.rb:74
                    • String#downcase $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:376
                    • Array#join $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:376
                    • #<Class:OpenSSL::HMAC>#digest $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:373
                  • SecureRandom.random_bytes /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/securerandom.rb:100
                    • Integer#to_int /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/securerandom.rb:101
                    • SecureRandom.gen_random /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/securerandom.rb:52
                      • #<Class:OpenSSL::Random>#random_bytes /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/securerandom.rb:64
                  • StudentsController#xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:380
                    • String#bytes $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:381
                    • String#each_byte $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                    • Enumerator#with_index $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                      • String#each_byte $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                        • StudentsController#block in xor_byte_strings $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                          • Integer#^ $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:382
                    • Array#pack $GemPath0/gems/actionpack-5.0.4/lib/action_controller/metal/request_forgery_protection.rb:383
                  • Base64.strict_encode64 /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/base64.rb:65
                    • Array#pack /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/base64.rb:66
            • #<Class:0x007f4a31e7cca0>#request_forgery_protection_token $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/controller_helper.rb:10
              • StudentsController#request_forgery_protection_token $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:112
                • StudentsController#config $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:143
                • #<Class:0x007f4a3027cfc8>#request_forgery_protection_token $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:20
                  • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/configurable.rb:20
                    • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                      • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                        • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                          • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                            • #<Class:0x007f4a3027cfc8>#block in initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
                              • ActiveSupport::OrderedOptions#[] $GemPath0/gems/activesupport-5.0.4/lib/active_support/ordered_options.rb:69
            • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/url_helper.rb:592
            • #<Class:0x007f4a31e7cca0>#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:75
              • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:76
              • #<Class:0x007f4a31e7cca0>#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
                • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
                • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                  • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                    • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                      • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                      • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                        • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                        • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                        • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                          • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                        • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                  • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                    • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                      • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                      • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                        • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                        • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                        • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                          • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                        • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                  • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                    • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                    • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                      • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                      • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                        • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                        • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                        • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                          • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                        • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                      • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
                      • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
              • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
                • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                  • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                    • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
          • ActiveSupport::SafeBuffer#+ $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:197
            • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:198
              • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:198
                • ActiveSupport::SafeBuffer#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:179
                  • String#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:180
                  • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
            • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
              • ActiveSupport::SafeBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
                • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
          • Hash#delete $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:866
            • #<Class:0x007f4a31e7cca0>#block in extra_tags_for_form $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:866
          • #<Class:0x007f4a31e7cca0>#utf8_enforcer_tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/form_tag_helper.rb:813
            • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
              • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
                • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                  • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
          • ActiveSupport::SafeBuffer#+ $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:197
            • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:198
              • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:198
                • ActiveSupport::SafeBuffer#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:179
                  • String#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:180
                  • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
            • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
              • ActiveSupport::SafeBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
                • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
                • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
        • #<Class:0x007f4a31e7cca0>#tag $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:75
          • Symbol#to_s $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:76
          • #<Class:0x007f4a31e7cca0>#tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:150
            • Hash#empty? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:151
            • Hash#each_pair $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
              • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                  • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                  • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                    • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                    • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                      • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                    • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                  • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
              • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                  • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                  • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                    • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                    • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                      • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                    • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                  • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
              • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                  • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                  • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                    • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                    • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                      • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                    • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                  • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
              • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                  • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                  • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                    • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                    • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                      • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                    • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                  • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
              • #<Class:0x007f4a31e7cca0>#block in tag_options $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:154
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Set#include? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
                • Kernel#nil? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:166
                • #<Class:0x007f4a31e7cca0>#tag_option $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:186
                  • Kernel#is_a? $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:187
                  • ERB::Util.unwrapped_html_escape $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:34
                    • String#to_s $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:35
                    • String#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:123
                    • ActiveSupport::Multibyte::Unicode.tidy_bytes $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:245
                      • String#scrub $GemPath0/gems/activesupport-5.0.4/lib/active_support/multibyte/unicode.rb:248
                    • CGI::Escape#escapeHTML $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:39
                  • String#gsub $GemPath0/gems/actionview-5.0.4/lib/action_view/helpers/tag_helper.rb:192
          • String#html_safe $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:257
            • Class#new $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:258
              • ActiveSupport::SafeBuffer#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:174
                • String#initialize $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:176
        • ActiveSupport::SafeBuffer#+ $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:197
          • Kernel#dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:198
            • Kernel#initialize_dup $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:198
              • ActiveSupport::SafeBuffer#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:179
                • String#initialize_copy $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:180
                • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
          • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
            • ActiveSupport::SafeBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
              • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
              • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
            • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
      • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:188
        • ActiveSupport::SafeBuffer#html_escape_interpolated_argument $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:245
          • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
          • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
        • String#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:189
      • ActiveSupport::SafeBuffer#safe_concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:169
        • ActiveSupport::SafeBuffer#html_safe? $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:212
        • ActiveSupport::SafeBuffer#concat $GemPath0/gems/activesupport-5.0.4/lib/active_support/core_ext/string/output_safety.rb:171