rails sを実行できません。。

Question

ターミナルで「rails s」を実行したら、
以下のようなエラーメッセージが出ました。
どうすれば解決しますか？

cloud9user:~/environment/myapp (master) $ rails s
=> Booting Puma
=> Rails 5.2.3 application starting in development 
=> Run `rails server -h` for more startup options
Exiting
Traceback (most recent call last):
        79: from bin/rails:3:in `<main>'
        78: from bin/rails:3:in `load'
        77: from /home/ec2-user/environment/myapp/bin/spring:15:in `<top (required)>'
        76: from /home/ec2-user/environment/myapp/bin/spring:15:in `require'
        75: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
        74: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
        73: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
        72: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
        71: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
        70: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
        69: from /home/ec2-user/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
        68: from /home/ec2-user/environment/myapp/bin/rails:9:in `<top (required)>'
        67: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
        66: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
        65: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require'
        64: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
        63: from /home/ec2-user/.rvm/rubies/ruby-

~省略~

2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
        27: from /home/ec2-user/environment/myapp/config/environment.rb:5:in `<main>'
        26: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/application.rb:361:in `initialize!'
        25: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:60:in `run_initializers'
        24: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
        23: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
        22: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
        21: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `call'
        20: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `each'
        19: 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'
        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:350:in `block (2 levels) in each_strongly_connected_component'
        16: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
        15: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:61:in `block in run_initializers'
        14: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:32:in `run'
        13: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:32:in `instance_exec'
        12: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.3/lib/rails/application/finisher.rb:75:in `block in <module:Finisher>'
        11: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
        10: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/lazy_load_hooks.rb:51:in `each'
         9: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
         8: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
         7: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
         6: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/lazy_load_hooks.rb:69:in `block in execute_hook'
         5: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/i18n_railtie.rb:19:in `block in <class:Railtie>'
         4: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/i18n_railtie.rb:43:in `initialize_i18n'
         3: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/i18n_railtie.rb:43:in `each'
         2: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/i18n_railtie.rb:47:in `block in initialize_i18n'
         1: from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/i18n_railtie.rb:47:in `flat_map'
/home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.3/lib/active_support/i18n_railtie.rb:47:in `each': undefined method `existent' for #<String:0x00000000046c61d8> (NoMethodError)
Did you mean?  extend

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.6.3'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.3'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby

# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of chromedriver to run system tests with Chrome
  gem 'chromedriver-helper'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

gem 'rails-i18n'

gem "jquery-rails"

gem 'bootstrap-sass'
gem 'will_paginate', '3.0.4'
gem 'will_paginate-bootstrap', '1.0.1'

NoMethodErrorとのことですが、ググっても解決法がわかりません。。

Comments

[hatsu]

i18n_railtie.rbって何か書き換えましたか？
そのファイルで「NoMethodError」とのことなので、ファイルの内容、特に47行目付近を追記していただければと思います！

[kazto]

Gemfileの内容を追記お願いします。

[退会済みユーザー]

追記させていただきました。

Answer 1

「activesupport existent nomethoderror」で検索しました。

https://github.com/rails/rails/issues/21228 の症状が似ているようです。

will_paginate のバージョンが 3.0.4 なのが原因と思われます。

これを最新（3.1.7）に上げてみてはいかがでしょうか。

Comments

[退会済みユーザー]

ありがとうございました。無事解決しました！