执行：bundle update
发生错误，无法运行rails s，
=> Booting Puma
=> Rails 5.0.7.2 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
Exiting
Traceback (most recent call last):
52: from bin/rails:3:in `<main>'
51: from bin/rails:3:in `load'
50: from /Users/sujize/job.3/job-listing/bin/spring:13:in `<top (required)>'
49: from /Users/sujize/job.3/job-listing/bin/spring:13:in `require'
48: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>'
47: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load'
46: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/spring-2.1.0/bin/spring:49:in `<top (required)>'
45: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/spring-2.1.0/lib/spring/client.rb:30:in `run'
44: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call'
43: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call'
42: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load'
41: from /Users/sujize/job.3/job-listing/bin/rails:9:in `<top (required)>'
40: from /Users/sujize/job.3/job-listing/bin/rails:9:in `require'
39: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands.rb:18:in `<top (required)>'
38: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
37: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands/commands_tasks.rb:85:in `server'
36: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands/commands_tasks.rb:85:in `tap'
35: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands/commands_tasks.rb:90:in `block in server'
34: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands/server.rb:102:in `start'
33: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands/server.rb:148:in `log_to_stdout'
32: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/server.rb:354:in `wrapped_app'
31: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/commands/server.rb:84:in `app'
30: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/server.rb:219:in `app'
29: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/server.rb:319:in `build_app_and_options_from_config'
28: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/builder.rb:40:in `parse_file'
27: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/builder.rb:49:in `new_from_string'
26: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/builder.rb:49:in `eval'
25: from /Users/sujize/job.3/job-listing/config.ru:in `<main>'
24: from /Users/sujize/job.3/job-listing/config.ru:in `new'
23: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
22: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/rack-2.0.7/lib/rack/builder.rb:55:in `instance_eval'
21: from /Users/sujize/job.3/job-listing/config.ru:3:in `block in <main>'
20: from /Users/sujize/job.3/job-listing/config.ru:3:in `require_relative'
19: from /Users/sujize/job.3/job-listing/config/environment.rb:5:in `<top (required)>'
18: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/application.rb:352:in `initialize!'
17: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/initializable.rb:54:in `run_initializers'
16: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
15: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
14: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
13: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:347:in `call'
12: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:347:in `each'
11: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
10: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
9: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
8: from /Users/sujize/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
7: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/initializable.rb:55:in `block in run_initializers'
6: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/initializable.rb:30:in `run'
5: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/railties-5.0.7.2/lib/rails/initializable.rb:30:in `instance_exec'
4: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/web-console-3.7.0/lib/web_console/railtie.rb:11:in `block in <class:Railtie>'
3: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/activesupport-5.0.7.2/lib/active_support/dependencies.rb:293:in `require'
2: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/activesupport-5.0.7.2/lib/active_support/dependencies.rb:259:in `load_dependency'
1: from /Users/sujize/.rvm/gems/ruby-2.6.1/gems/activesupport-5.0.7.2/lib/active_support/dependencies.rb:293:in `block in require'
/Users/sujize/.rvm/gems/ruby-2.6.1/gems/activesupport-5.0.7.2/lib/active_support/dependencies.rb:293:in `require': cannot load such file -- bindex (LoadError)
尝试： gem install bindex
bundle update
gem update
全失败，都出现同样的错误。但有一点不同的是，这个新建的app在其他电脑上可以运行，这说明这个新建的app，各个功能都是没有问题的，有问题的是自己本机电脑，并且考虑到自己本机rails和ruby都是最新版本,会不会是版本不兼容？于是，尝试将rails 和ruby降级，结果问题解决。
rails -v 6.0.0
ruby -v 2.6.0
将它们降级，执行：
gem install rails -v 5.2.4
rvm install 2.5.3
错误解决。
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