Internal error when accessing few pages

[HanXHX]

Hi i have an "internal error" 500. When i want to access to config.

Redmine version: 3.020140825-8deb
OS: Debian Jessie 64 bits
Database: MariaDB 10.0.30

Install seems ok:

# rake redmine:plugins:migrate RAILS_ENV=production
Migrating redmine_base_deface (Redmine Base Deface plugin)...
Migrating redmine_customize_core_fields (Redmine Customize Core Fields plugin)...
== 1 CreateCoreFieldsTable: migrating =========================================
-- create_table("core_fields", {:force=>true})
   -> 0.2095s
== 1 CreateCoreFieldsTable: migrated (0.2095s) ================================

== 2 CreateCoreFieldsRoles: migrating =========================================
-- create_table(:core_fields_roles, {:id=>false})
   -> 0.1794s
-- add_index(:core_fields_roles, [:core_field_id, :role_id], {:unique=>true, :name=>:core_fields_roles_ids})
   -> 0.1594s
== 2 CreateCoreFieldsRoles: migrated (0.3389s) ================================

Logs:

Started GET "/core_fields" for 62.212.123.212 at 2017-03-31 16:24:33 +0200
Processing by CoreFieldsController#index as HTML
  Current user: hanx (id=3)
WARNING: Can't mass-assign protected attributes for CoreField: identifier

Mysql2::Error: Field 'identifier' doesn't have a default value: INSERT INTO `core_fields` VALUES ()
Completed 500 Internal Server Error in 5ms (ActiveRecord: 1.0ms)

ActiveRecord::StatementInvalid (Mysql2::Error: Field 'identifier' doesn't have a default value: INSERT INTO `core_fields` VALUES ()):
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `query'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `block in execute'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract_adapter.rb:378:in `block in log'
  activesupport (4.1.16) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract_adapter.rb:372:in `log'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `execute'
  activerecord (4.1.16) lib/active_record/connection_adapters/mysql2_adapter.rb:228:in `execute'
  activerecord (4.1.16) lib/active_record/connection_adapters/mysql2_adapter.rb:250:in `exec_insert'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract/database_statements.rb:95:in `insert'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
  activerecord (4.1.16) lib/active_record/relation.rb:64:in `insert'
  activerecord (4.1.16) lib/active_record/persistence.rb:504:in `_create_record'
  activerecord (4.1.16) lib/active_record/attribute_methods/dirty.rb:87:in `_create_record'
  activerecord (4.1.16) lib/active_record/callbacks.rb:306:in `block in _create_record'
  activesupport (4.1.16) lib/active_support/callbacks.rb:113:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:113:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:552:in `block (2 levels) in compile'
  activesupport (4.1.16) lib/active_support/callbacks.rb:502:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:502:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:86:in `run_callbacks'
  activerecord (4.1.16) lib/active_record/callbacks.rb:306:in `_create_record'
  activerecord (4.1.16) lib/active_record/timestamp.rb:57:in `_create_record'
  activerecord (4.1.16) lib/active_record/persistence.rb:484:in `create_or_update'
  activerecord (4.1.16) lib/active_record/callbacks.rb:302:in `block in create_or_update'
  activesupport (4.1.16) lib/active_support/callbacks.rb:113:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:113:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:552:in `block (2 levels) in compile'
  activesupport (4.1.16) lib/active_support/callbacks.rb:502:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:502:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:86:in `run_callbacks'
  activerecord (4.1.16) lib/active_record/callbacks.rb:302:in `create_or_update'
  activerecord (4.1.16) lib/active_record/persistence.rb:125:in `save!'
  activerecord (4.1.16) lib/active_record/validations.rb:57:in `save!'
  activerecord (4.1.16) lib/active_record/attribute_methods/dirty.rb:29:in `save!'
  activerecord (4.1.16) lib/active_record/transactions.rb:273:in `block in save!'
  activerecord (4.1.16) lib/active_record/transactions.rb:329:in `block in with_transaction_returning_status'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `block in transaction'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract/database_statements.rb:209:in `within_new_transaction'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `transaction'
  activerecord (4.1.16) lib/active_record/transactions.rb:208:in `transaction'
  activerecord (4.1.16) lib/active_record/transactions.rb:326:in `with_transaction_returning_status'
  activerecord (4.1.16) lib/active_record/transactions.rb:273:in `save!'
  /usr/lib/ruby/vendor_ruby/active_record/mass_assignment_security/validations.rb:17:in `create!'
  activerecord (4.1.16) lib/active_record/relation.rb:147:in `block in create!'
  activerecord (4.1.16) lib/active_record/relation.rb:292:in `scoping'
  activerecord (4.1.16) lib/active_record/relation.rb:147:in `create!'
  activerecord (4.1.16) lib/active_record/relation.rb:215:in `find_or_create_by!'
  activerecord (4.1.16) lib/active_record/querying.rb:6:in `find_or_create_by!'
  plugins/redmine_customize_core_fields/app/controllers/core_fields_controller.rb:15:in `block (3 levels) in index'
  plugins/redmine_customize_core_fields/app/controllers/core_fields_controller.rb:14:in `each'
  plugins/redmine_customize_core_fields/app/controllers/core_fields_controller.rb:14:in `each_with_index'
  plugins/redmine_customize_core_fields/app/controllers/core_fields_controller.rb:14:in `block (2 levels) in index'
  actionpack (4.1.16) lib/action_controller/metal/mime_responds.rb:258:in `call'
  actionpack (4.1.16) lib/action_controller/metal/mime_responds.rb:258:in `respond_to'
  plugins/redmine_customize_core_fields/app/controllers/core_fields_controller.rb:11:in `index'
  actionpack (4.1.16) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  actionpack (4.1.16) lib/abstract_controller/base.rb:189:in `process_action'
  actionpack (4.1.16) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (4.1.16) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
  activesupport (4.1.16) lib/active_support/callbacks.rb:113:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:113:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:552:in `block (2 levels) in compile'
  activesupport (4.1.16) lib/active_support/callbacks.rb:502:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:502:in `call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:86:in `run_callbacks'
  actionpack (4.1.16) lib/abstract_controller/callbacks.rb:19:in `process_action'
  actionpack (4.1.16) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.1.16) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
  activesupport (4.1.16) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.1.16) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.1.16) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.1.16) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.1.16) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
  activerecord (4.1.16) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.1.16) lib/abstract_controller/base.rb:136:in `process'
  actionview (4.1.16) lib/action_view/rendering.rb:30:in `process'
  actionpack (4.1.16) lib/action_controller/metal.rb:196:in `dispatch'
  actionpack (4.1.16) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.1.16) lib/action_controller/metal.rb:232:in `block in action'
  actionpack (4.1.16) lib/action_dispatch/routing/route_set.rb:80:in `call'
  actionpack (4.1.16) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
  actionpack (4.1.16) lib/action_dispatch/routing/route_set.rb:48:in `call'
  actionpack (4.1.16) lib/action_dispatch/journey/router.rb:73:in `block in call'
  actionpack (4.1.16) lib/action_dispatch/journey/router.rb:59:in `each'
  actionpack (4.1.16) lib/action_dispatch/journey/router.rb:59:in `call'
  actionpack (4.1.16) lib/action_dispatch/routing/route_set.rb:690:in `call'
  /usr/lib/ruby/vendor_ruby/rack/openid.rb:98:in `call'
  rack (1.5.5) lib/rack/etag.rb:23:in `call'
  rack (1.5.5) lib/rack/conditionalget.rb:25:in `call'
  rack (1.5.5) lib/rack/head.rb:11:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/flash.rb:254:in `call'
  rack (1.5.5) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.5.5) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/cookies.rb:562:in `call'
  activerecord (4.1.16) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.1.16) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.1.16) lib/active_support/callbacks.rb:82:in `run_callbacks'
  actionpack (4.1.16) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.1.16) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.1.16) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.1.16) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.1.16) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.1.16) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.1.16) lib/rails/rack/logger.rb:20:in `call'
  /usr/lib/ruby/vendor_ruby/request_store/middleware.rb:8:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.5) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.5) lib/rack/runtime.rb:17:in `call'
  activesupport (4.1.16) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
  actionpack (4.1.16) lib/action_dispatch/middleware/static.rb:84:in `call'
  rack (1.5.5) lib/rack/sendfile.rb:112:in `call'
  railties (4.1.16) lib/rails/engine.rb:514:in `call'
  railties (4.1.16) lib/rails/application.rb:144:in `call'
  railties (4.1.16) lib/rails/railtie.rb:194:in `public_send'
  railties (4.1.16) lib/rails/railtie.rb:194:in `method_missing'
  /usr/lib/ruby/vendor_ruby/thin/connection.rb:80:in `block in pre_process'
  /usr/lib/ruby/vendor_ruby/thin/connection.rb:78:in `catch'
  /usr/lib/ruby/vendor_ruby/thin/connection.rb:78:in `pre_process'
  /usr/lib/ruby/vendor_ruby/thin/connection.rb:53:in `process'
  /usr/lib/ruby/vendor_ruby/thin/connection.rb:38:in `receive_data'
  /usr/lib/ruby/vendor_ruby/eventmachine.rb:187:in `run_machine'
  /usr/lib/ruby/vendor_ruby/eventmachine.rb:187:in `run'
  /usr/lib/ruby/vendor_ruby/thin/backends/base.rb:61:in `start'
  /usr/lib/ruby/vendor_ruby/thin/server.rb:159:in `start'
  /usr/lib/ruby/vendor_ruby/thin/controllers/controller.rb:86:in `start'
  /usr/lib/ruby/vendor_ruby/thin/runner.rb:185:in `run_command'
  /usr/lib/ruby/vendor_ruby/thin/runner.rb:151:in `run!'
  /usr/bin/thin:6:in `<main>'


Started GET "/issues/5" for 62.212.123.212 at 2017-03-31 16:28:37 +0200
Processing by IssuesController#show as HTML
  Parameters: {"id"=>"5"}
  Current user: hanx (id=3)
  Rendered issues/_action_menu.html.erb (1.1ms)
  Rendered issues/show.html.erb within layouts/base (5.3ms)
Completed 500 Internal Server Error in 31ms (ActiveRecord: 2.5ms)

ActionView::Template::Error (undefined method `not_visible' for #<Class:0x00000004ebdbe8>):
    36:   rows.left l(:field_status), h(@issue.status.name), :class => 'status'
    37:   rows.left l(:field_priority), h(@issue.priority.name), :class => 'priority'
    38: 
    39:   unless @issue.disabled_core_fields.include?('assigned_to_id')
    40:     rows.left l(:field_assigned_to), avatar(@issue.assigned_to, :size => "14").to_s.html_safe + (@issue.assigned_to ? link_to_user(@issue.assigned_to) : "-"), :class => 'assigned-to'
    41:   end
    42:   unless @issue.disabled_core_fields.include?('category_id')
  app/views/issues/show.html.erb:39:in `block in _f14401c1683d3288c414b0ae8a75f256'
  app/helpers/issues_helper.rb:158:in `issue_fields_rows'
  app/views/issues/show.html.erb:35:in `_f14401c1683d3288c414b0ae8a75f256'
  app/controllers/issues_controller.rb:130:in `block (2 levels) in show'
  app/controllers/issues_controller.rb:127:in `show'