未找到 Webpacker 配置文件 - Rails 6.0.0
我试图运行“rails s”来运行我的服务器，然后我突然遇到一个错误，说找不到 webpacker 配置。
这是信息：
boot@noki-K54C:~/Desktop/app$ 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
<b>Traceback</b> (most recent call last):
79: from bin/rails:3:in `<main>'
78: from bin/rails:3:in `load'
77: from /home/app/Desktop/jonabell/bin/spring:15:in `<top (required)>'
76: from /home/app/Desktop/jonabell/bin/spring:15:in `require'
75: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
74: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
73: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
72: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
71: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
70: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
69: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
68: from /home/app/Desktop/jonabell/bin/rails:9:in `<top (required)>'
67: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
66: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
65: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
64: from /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
63: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
61: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
59: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands.rb:18:in `<main>'
58: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/command.rb:46:in `invoke'
57: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/command/base.rb:65:in `perform'
56: from /home/app/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
55: from /home/app/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
54: from /home/app/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
53: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `perform'
52: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `tap'
51: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:147:in `block in perform'
50: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:37:in `start'
49: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:77:in `log_to_stdout'
48: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/server.rb:354:in `wrapped_app'
47: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/server.rb:219:in `app'
46: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/server.rb:319:in `build_app_and_options_from_config'
45: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:40:in `parse_file'
44: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `new_from_string'
43: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
39: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:48:in `require_relative'
36: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
35: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
34: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
33: from /home/app/.rvm/gems/ruby-2.6.0/gems/zeitwerk-2.1.10/lib/zeitwerk/kernel.rb:23:in `require'
32: from /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
31: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
29: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
27: from /home/app/Desktop/jonabell/config/environment.rb:5:in `<main>'
26: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/application.rb:363:in `initialize!'
25: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:60:in `run_initializers'
24: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
23: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
22: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
21: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:347:in `call'
20: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:347:in `each'
19: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
18: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
17: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
16: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
15: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:61:in `block in run_initializers'
14: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `run'
13: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `instance_exec'
12: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/railtie.rb:84:in `block in <class:Engine>'
11: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker.rb:27:in `bootstrap'
10: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/commands.rb:14:in `bootstrap'
9: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:18:in `refresh'
8: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:83:in `load'
7: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:47:in `public_manifest_path'
6: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:43:in `public_output_path'
5: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:39:in `public_path'
4: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:80:in `fetch'
3: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:84:in `data'
2: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `load'
1: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `read'
/home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `read': <b>No such file or directory @ rb_sysopen - /home/app/Desktop/jonabell/config/webpacker.yml (</b><u style="text-decoration-style:single"><b>Errno::ENOENT</b></u><b>)</b>
78: from bin/rails:3:in `<main>'
77: from bin/rails:3:in `load'
76: from /home/app/Desktop/jonabell/bin/spring:15:in `<top (required)>'
75: from /home/app/Desktop/jonabell/bin/spring:15:in `require'
74: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
73: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
72: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
71: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
70: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
69: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
68: from /home/app/.rvm/gems/ruby-2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
67: from /home/app/Desktop/jonabell/bin/rails:9:in `<top (required)>'
66: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
65: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
64: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
63: from /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
62: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
60: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
58: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands.rb:18:in `<main>'
57: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/command.rb:46:in `invoke'
56: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/command/base.rb:65:in `perform'
55: from /home/app/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
54: from /home/app/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
53: from /home/app/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
52: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `perform'
51: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `tap'
50: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:147:in `block in perform'
49: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:37:in `start'
48: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:77:in `log_to_stdout'
47: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/server.rb:354:in `wrapped_app'
46: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/server.rb:219:in `app'
45: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/server.rb:319:in `build_app_and_options_from_config'
44: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:40:in `parse_file'
43: from /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `new_from_string'
42: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
38: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:48:in `require_relative'
35: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `require'
34: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:291:in `load_dependency'
33: from /home/app/.rvm/gems/ruby-2.6.0/gems/activesupport-6.0.0/lib/active_support/dependencies.rb:325:in `block in require'
32: from /home/app/.rvm/gems/ruby-2.6.0/gems/zeitwerk-2.1.10/lib/zeitwerk/kernel.rb:23:in `require'
31: from /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
30: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
28: from /home/app/.rvm/gems/ruby-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 /home/app/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
26: from /home/app/Desktop/jonabell/config/environment.rb:5:in `<main>'
25: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/application.rb:363:in `initialize!'
24: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:60:in `run_initializers'
23: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
22: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
21: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
20: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:347:in `call'
19: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:347:in `each'
18: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
17: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
16: from /usr/share/rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
14: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:61:in `block in run_initializers'
13: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `run'
12: from /home/app/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:32:in `instance_exec'
11: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/railtie.rb:84:in `block in <class:Engine>'
10: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker.rb:27:in `bootstrap'
9: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/commands.rb:14:in `bootstrap'
8: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:18:in `refresh'
7: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:83:in `load'
6: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:47:in `public_manifest_path'
5: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:43:in `public_output_path'
4: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:39:in `public_path'
3: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:80:in `fetch'
2: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:84:in `data'
1: from /home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:87:in `load'
/home/app/.rvm/gems/ruby-2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:91:in `rescue in load': <b>Webpacker configuration file not found /home/app/Desktop/jonabell/config/webpacker.yml. Please run rails webpacker:install Error: No such file or directory @ rb_sysopen - /home/app/Desktop/jonabell/config/webpacker.yml (</b><u style="text-decoration-style:single"><b>RuntimeError</b></u><b>)</b>
boot@noki-K54C:~/Desktop/app$
我已经检查了 rails 的版本和它的 6.0.0 我的 ruby 版本是 2.6.0。
试图在网上搜索并尝试一些解决方案，但对我来说没有用。
知道我错过了什么吗？
小智 95
从 Rails 6 开始，Webpacker 是默认的 JavaScript 编译器。因此，您还必须在启动 Rails 服务器之前对其进行设置。
yarn使用您的操作系统包管理器安装，或查看https://yarnpkg.com/en/docs/install- 设置它
rails webpacker:install - 确保所有软件包都是最新的
yarn install --check-files - 启动你的 Rails 服务器
rails s
享受！
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Wil*_*ire 12
要补充已经说过的内容，请务必查看错误消息以获取有关如何解决问题的说明。在这种情况下，错误说：
..."Please run rails webpacker:install"...
一旦你运行rails webpacker:install你会看到你没有安装yarn的错误，在这种情况下你可以去安装说明来找出如何为你的操作系统安装yarn。对于 unix（我在 unix Amazon Cloud9 环境中），我必须运行：
curl -o- -L https://yarnpkg.com/install.sh | bash
然后我能够成功运行rails webpacker:install，然后一旦我运行，rails server我就看到了错误：
========================================
Your Yarn packages are out of date!
Please run `yarn install --check-files` to update.
========================================
安装后，rails s工作得很好。
我希望能更深入地了解如何“调试”问题！
安装 Rails 并设置新应用程序后，一旦我尝试运行rails server，我就遇到了此错误。我查了一下config/，webpack配置文件丢失了。
按照我的方法，我可以修复它并使其 100% 工作。
转到 Rails 应用程序的根目录并按照以下说明进行操作。
安装webpacker
bundle exec rails webpacker:install
命令。
有条件的
如果您的系统没有nodejs，则需要
nodejs从https://nodejs.org/en/download/安装一旦安装了 Nodejs，它可能会抛出另一个错误，
yarn not installed在这种情况下，运行命令
npm install --global yarn
在对上述所有内容进行排序后，我能够运行rails server并工作。
上述命令是在 MacOS Mojave 中执行的，请在继续之前检查相应的操作系统命令以安装节点/yarn。
要查看完整的安装和运行说明，您可以检查：https://medium.com/intelligent-computing/up-and-running-your-first-ruby-on-rails-app-with-troubleshooting-83e694d87605
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