rails sで起動しなくなった。NoMethodError

Question

コードを修正して、rails s　を入力すると下記のコードが出てrailsが起動してくれなくなりました。

色々と数時間ググってみたのですが、良くわかりませんでした。
解決方法をご助言頂ければ幸いです。

=> Booting Puma
=> Rails 5.1.6 application starting in development 
=> Run `rails server -h` for more startup options
Exiting
Traceback (most recent call last):
        69: from bin/rails:3:in `<main>'
        68: from bin/rails:3:in `load'
        67: from /home/ec2-user/environment/twtkeiba_app2/bin/spring:15:in `<top (required)>'
        66: from /home/ec2-user/environment/twtkeiba_app2/bin/spring:15:in `require'
        65: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
        64: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
        63: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
        62: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
        61: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
        60: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
        59: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
        58: from /home/ec2-user/environment/twtkeiba_app2/bin/rails:9:in `<top (required)>'
        57: from /home/ec2-user/environment/twtkeiba_app2/bin/rails:9:in `require'
        56: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/commands.rb:16:in `<top (required)>'
        55: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/command.rb:44:in `invoke'
        54: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/command/base.rb:63:in `perform'
        53: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/thor-1.0.1/lib/thor.rb:392:in `dispatch'
        52: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/thor-1.0.1/lib/thor/invocation.rb:127:in `invoke_command'
        51: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/thor-1.0.1/lib/thor/command.rb:27:in `run'
        50: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in `perform'
        49: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in `tap'
        48: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:135:in `block in perform'
        47: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:42:in `start'
        46: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:80:in `log_to_stdout'
        45: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/server.rb:354:in `wrapped_app'
        44: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:24:in `app'
        43: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/server.rb:219:in `app'
        42: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/server.rb:319:in `build_app_and_options_from_config'
        41: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/builder.rb:40:in `parse_file'
        40: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/builder.rb:49:in `new_from_string'
        39: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/builder.rb:49:in `eval'
        38: from config.ru:in `<main>'
        37: from config.ru:in `new'
        36: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
        35: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/rack-2.0.7/lib/rack/builder.rb:55:in `instance_eval'
        34: from config.ru:3:in `block in <main>'
        33: from config.ru:3:in `require_relative'
        32: from /home/ec2-user/environment/twtkeiba_app2/config/environment.rb:5:in `<top (required)>'
        31: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/application.rb:353:in `initialize!'
        30: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/initializable.rb:58:in `run_initializers'
        29: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
        28: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
        27: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
        26: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `call'
        25: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `each'
        24: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
        23: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:415:in `each_strongly_connected_component_from'
        22: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:415:in `call'
        21: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/initializable.rb:48:in `tsort_each_child'
        20: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/initializable.rb:48:in `each'
        19: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:421:in `block in each_strongly_connected_component_from'
        18: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
        17: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:422:in `block (2 levels) in each_strongly_connected_component_from'
        16: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        15: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
        14: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/initializable.rb:59:in `block in run_initializers'
        13: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/initializable.rb:30:in `run'
        12: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/initializable.rb:30:in `instance_exec'
        11: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/engine.rb:599:in `block in <class:Engine>'
        10: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/engine.rb:599:in `each'
         9: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/engine.rb:600:in `block (2 levels) in <class:Engine>'
         8: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
         7: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:258:in `load_dependency'
         6: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `block in require'
         5: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
         4: from /home/ec2-user/environment/twtkeiba_app2/config/environments/development.rb:1:in `<top (required)>'
         3: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/railtie.rb:211:in `configure'
         2: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/railtie.rb:211:in `instance_eval'
         1: from /home/ec2-user/environment/twtkeiba_app2/config/environments/development.rb:24:in `block in <top (required)>'
/home/ec2-user/.rvm/gems/ruby-2.6.3/gems/railties-5.1.6/lib/rails/railtie/configuration.rb:95:in `method_missing': undefined method `action_controller' for #<Rails::Application::Configuration:0x000000000344b940> (NoMethodError)

Answer 1

$gem uninstall railties --version '5.1.6'
を実行してみたらどうなりますか？

Comments

[hiraba]

$gem uninstall railties --version '5.1.6'　で「Successfully uninstalled railties-5.1.6」したのですが、rails sを入力したら、似た感じのエラーが出ます。
何が悪いんでしょうか。。。。

[k-810]

$bundle install
や
$bundle update
は試してみましたか？

[hiraba]

$bundle install
$bundle update
両方やってみましたが、ダメです。。。

[k-810]

http://americandog1993.hatenablog.jp/entry/2017/07/25/222426
https://stackoverflow.com/questions/23283252/rails-s-error-method-missing-undefined-method-active-record/23283425
これらが似たエラーだと思われます

config/application.rb
の中から
config.action_controller
をコメントアウトしたら動きそうです

[hiraba]

ありがとうございます。

[hiraba]

config/application.rbの記述がおかしかったことがわかりました。
それを修正してrails sをしたら起動しました。

ここで質問をするまでは、どこが悪かったのかすらわからず、
数時間もググっていましたが、k-810さんの助言でconfig/application.rbを見直すことができました。
ありがとうございます。

[k-810]

解決されたようでよかったです！