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Help us understand the problem. What is going on with this article?
@miriwo

mac で コマンド$ rails server を実行した時にエラーが出た話

More than 1 year has passed since last update.

目的

  • サーバをスタートするコマンド$ rails serverを実行した時のエラー解決法を知る。

エラー内容

$ MacBook-miriwo:test_app admin$ rails s
MacBook-miriwo:test_app admin$ rails s
=> Booting Puma
=> Rails 6.0.0 application starting in development 
=> Run `rails server --help` for more startup options
RAILS_ENV=development environment is not defined in config/webpacker.yml, falling back to production environment
Exiting
Traceback (most recent call last):
    80: from bin/rails:3:in `<main>'
    79: from bin/rails:3:in `load'
    78: from /Users/admin/Documents/test/test_app/bin/spring:15:in `<top (required)>'
    77: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
・
・
・
MacBook-miriwo:test_app admin$ rails webpacker:install
Yarn not installed. Please download and install Yarn from https://yarnpkg.com/lang/en/docs/install/

解決方法

  • コマンド$ rails webpacker:installを実行しようとしたところでエラーがでた。
$ rails webpacker:install
Yarn not installed. Please download and install Yarn from https://yarnpkg.com/lang/en/docs/install/
  • yarnが入っていないためエラーが出たようなのでコマンドbrew install yarnを実行して入れた。
$ brew install yarn
==> Installing dependencies for yarn: node
==> Installing yarn dependency: node
==> Downloading https://homebrew.bintray.com/bottles/node-12.12.0.high_sierra.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/0f/0f35e88be5a84c808dba472d053af25639b300c095392f63e85d9ae94cf12b20
・
・
・
  • コマンド$ rails webpacker:installを実行した。
$ rails webpacker:install
RAILS_ENV=development environment is not defined in config/webpacker.yml, falling back to production environment
      create  config/webpacker.yml
Copying webpack core config
      create  config/webpack
      create  config/webpack/development.js
      create  config/webpack/environment.js
・
・
・
  • コマンド$ rails serverを実行したところ、正常にローカルサーバが起動した。
$ rails s
=> Booting Puma
=> Rails 6.0.0 application starting in development 
=> Run `rails server --help` for more startup options
Puma starting in single mode...
* Version 3.12.1 (ruby 2.6.4-p104), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://localhost:3000
・
・
・

付録

  • コマンド$ rails serverを実行した時のエラーを記載する。
$ rails s
=> Booting Puma
=> Rails 6.0.0 application starting in development 
=> Run `rails server --help` for more startup options
RAILS_ENV=development environment is not defined in config/webpacker.yml, falling back to production environment
Exiting
Traceback (most recent call last):
    80: from bin/rails:3:in `<main>'
    79: from bin/rails:3:in `load'
    78: from /Users/admin/Documents/test/test_app/bin/spring:15:in `<top (required)>'
    77: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    76: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    75: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
    74: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
    73: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
    72: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
    71: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
    70: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
    69: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
    68: from /Users/admin/Documents/test/test_app/bin/rails:9:in `<top (required)>'
    67: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
    66: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
    65: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
    64: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
    63: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
    62: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
    61: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
    60: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
    59: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands.rb:18:in `<main>'
    58: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/command.rb:46:in `invoke'
    57: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/command/base.rb:65:in `perform'
    56: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
    55: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
    54: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
    53: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `perform'
    52: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `tap'
    51: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:147:in `block in perform'
    50: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:37:in `start'
    49: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:77:in `log_to_stdout'
    48: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/server.rb:354:in `wrapped_app'
    47: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/server.rb:219:in `app'
    46: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/server.rb:319:in `build_app_and_options_from_config'
    45: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:40:in `parse_file'
    44: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `new_from_string'
    43: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `eval'
    42: from config.ru:in `<main>'
    41: from config.ru:in `new'
    40: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
    39: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `instance_eval'
    38: from config.ru:3:in `block in <main>'
    37: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:48:in `require_relative'
    36: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
    35: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
    34: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
    33: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/zeitwerk-2.2.0/lib/zeitwerk/kernel.rb:23:in `require'
    32: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
    31: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
    30: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
    29: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
    28: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
    27: from /Users/admin/Documents/test/test_app/config/environment.rb:5:in `<main>'
    26: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/application.rb:363:in `initialize!'
    25: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:60:in `run_initializers'
    24: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
    23: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
    22: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
    21: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:347:in `call'
    20: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:347:in `each'
    19: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
    18: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
    17: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
    16: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
    15: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:61:in `block in run_initializers'
    14: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `run'
    13: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `instance_exec'
    12: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/railtie.rb:84:in `block in <class:Engine>'
    11: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker.rb:27:in `bootstrap'
    10: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/commands.rb:14:in `bootstrap'
     9: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:18:in `refresh'
     8: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:83:in `load'
     7: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:47:in `public_manifest_path'
     6: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:43:in `public_output_path'
     5: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:39:in `public_path'
     4: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:80:in `fetch'
     3: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:84:in `data'
     2: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `load'
     1: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `read'
/Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `read': No such file or directory @ rb_sysopen - /Users/admin/Documents/test/test_app/config/webpacker.yml (Errno::ENOENT)
    79: from bin/rails:3:in `<main>'
    78: from bin/rails:3:in `load'
    77: from /Users/admin/Documents/test/test_app/bin/spring:15:in `<top (required)>'
    76: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    75: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    74: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
    73: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
    72: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
    71: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
    70: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
    69: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
    68: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
    67: from /Users/admin/Documents/test/test_app/bin/rails:9:in `<top (required)>'
    66: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
    65: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
    64: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
    63: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
    62: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
    61: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
    60: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
    59: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
    58: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands.rb:18:in `<main>'
    57: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/command.rb:46:in `invoke'
    56: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/command/base.rb:65:in `perform'
    55: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
    54: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
    53: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
    52: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `perform'
    51: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `tap'
    50: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:147:in `block in perform'
    49: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:37:in `start'
    48: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:77:in `log_to_stdout'
    47: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/server.rb:354:in `wrapped_app'
    46: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/server.rb:219:in `app'
    45: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/server.rb:319:in `build_app_and_options_from_config'
    44: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:40:in `parse_file'
    43: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `new_from_string'
    42: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `eval'
    41: from config.ru:in `<main>'
    40: from config.ru:in `new'
    39: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
    38: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `instance_eval'
    37: from config.ru:3:in `block in <main>'
    36: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:48:in `require_relative'
    35: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
    34: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
    33: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
    32: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/zeitwerk-2.2.0/lib/zeitwerk/kernel.rb:23:in `require'
    31: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
    30: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
    29: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
    28: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
    27: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
    26: from /Users/admin/Documents/test/test_app/config/environment.rb:5:in `<main>'
    25: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/application.rb:363:in `initialize!'
    24: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:60:in `run_initializers'
    23: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
    22: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
    21: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
    20: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:347:in `call'
    19: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:347:in `each'
    18: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
    17: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
    16: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
    15: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
    14: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:61:in `block in run_initializers'
    13: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `run'
    12: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `instance_exec'
    11: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/railtie.rb:84:in `block in <class:Engine>'
    10: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker.rb:27:in `bootstrap'
     9: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/commands.rb:14:in `bootstrap'
     8: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:18:in `refresh'
     7: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:83:in `load'
     6: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:47:in `public_manifest_path'
     5: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:43:in `public_output_path'
     4: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:39:in `public_path'
     3: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:80:in `fetch'
     2: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:84:in `data'
     1: from /Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:87:in `load'
/Users/admin/.anyenv/envs/rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:91:in `rescue in load': Webpacker configuration file not found /Users/admin/Documents/test/test_app/config/webpacker.yml. Please run rails webpacker:install Error: No such file or directory @ rb_sysopen - /Users/admin/Documents/test/test_app/config/webpacker.yml (RuntimeError)
MacBook-miriwo:test_app admin$ rails webpacker:install
Yarn not installed. Please download and install Yarn from https://yarnpkg.com/lang/en/docs/install/
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miriwo
web系のバックエンドの知識を習得中! 2019/07/07~毎日更新中!
boomtechcafe
埼玉県の朝霞台を拠点にエンジニアの勉強会、交流会等のイベントを企画しています! 朝霞台駅か北朝霞駅が全然行けちゃうぜってエンジニアの方がいたら是非! もくもく会とかゲーム大会とかもやれたらな~って思ってます。

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Help us understand the problem. What is going on with this article?