命令“Rails服务器”不能工作，或者Rails服务器命令不能工作

Question

当我运行"rails服务器“或"rails s”时，我得到了一个错误。

你好，我正在学习Rails，我得到了错误

这是错误代码

Traceback (most recent call last):
    52: from bin/rails:2:in `<main>'
    51: from bin/rails:2:in `load'
    50: from /home/wghu/Desktop/HelloRails/bin/spring:7:in `<top (required)>'
    49: from /home/wghu/Desktop/HelloRails/bin/spring:7:in `tap'
    48: from /home/wghu/Desktop/HelloRails/bin/spring:10:in `block in <top (required)>'
    47: from /usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb:85:in `require'
    46: from /usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb:85:in `require'
    45: from /var/lib/gems/2.7.0/gems/spring-3.0.0/lib/spring/binstub.rb:11:in `<top (required)>'
    44: from /var/lib/gems/2.7.0/gems/spring-3.0.0/lib/spring/binstub.rb:11:in `load'
    43: from /var/lib/gems/2.7.0/gems/spring-3.0.0/bin/spring:49:in `<top (required)>'
    42: from /var/lib/gems/2.7.0/gems/spring-3.0.0/lib/spring/client.rb:30:in `run'
    41: from /var/lib/gems/2.7.0/gems/spring-3.0.0/lib/spring/client/command.rb:7:in `call'
    40: from /var/lib/gems/2.7.0/gems/spring-3.0.0/lib/spring/client/rails.rb:28:in `call'
    39: from /var/lib/gems/2.7.0/gems/spring-3.0.0/lib/spring/client/rails.rb:28:in `load'
    38: from /home/wghu/Desktop/HelloRails/bin/rails:4:in `<top (required)>'
    37: from /home/wghu/Desktop/HelloRails/bin/rails:4:in `require_relative'
    36: from /home/wghu/Desktop/HelloRails/config/boot.rb:4:in `<top (required)>'
    35: from /home/wghu/Desktop/HelloRails/config/boot.rb:4:in `require'
    34: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/setup.rb:4:in `<top (required)>'
    33: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap.rb:112:in `default_setup'
    32: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap.rb:70:in `setup'
    31: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/compile_cache.rb:20:in `setup'
    30: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/compile_cache/yaml.rb:50:in `install!'
    29: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/compile_cache/yaml.rb:55:in `init!'
    28: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
    27: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
    26: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
    25: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
    24: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
    23: from /usr/lib/ruby/2.7.0/yaml.rb:4:in `<main>'
    22: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
    21: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
    20: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
    19: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
    18: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
    17: from /usr/lib/ruby/2.7.0/psych.rb:15:in `<main>'
    16: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
    15: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
    14: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
    13: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
    12: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
    11: from /usr/lib/ruby/2.7.0/psych/nodes.rb:2:in `<main>'
    10: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
     9: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
     8: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
     7: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
     6: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
     5: from /usr/lib/ruby/2.7.0/psych/nodes/node.rb:2:in `<main>'
     4: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
     3: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
     2: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
     1: from /var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/var/lib/gems/2.7.0/gems/bootsnap-1.9.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require': superclass mismatch for class StringIO (TypeError)

之前运行时的命令

rails g controller home index           

ubuntu版本

21.10

我的红宝石版本

ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x86_64-linux-gnu]

谢谢你帮我

Answer 1

在您的Gemfile?中指明了哪个红宝石版本

您是否安装了rbenv或rvm ruby版本管理器？

如果不是，我建议您这样做，因为它使每个项目(以及全球范围内)的Ruby处理更加容易，也更容易。

您可以在gorails中查看本文以安装rbenv：Install Ruby On Rails on Ubuntu#rbenv。

小心：如果您选择安装rbenv，请记住多个版本管理器是不好的想法，所以不要意外地继续安装rvm。这并不意味着要在同一个系统中共存。只对这一部分采取后续行动：

rbenv install 3.0.2 (或者你想要的任何版本-最好是你的Gemfile中的那个)

rbenv global 3.0.2 (与您安装的版本相同)

ruby -v

之后，请在文件夹中重新运行bundle install，然后再次运行rails s。让我们知道进展如何。

Answer 2

在更新了我的宝石之后，我开始得到这个错误。我试着卸载ruby和我所有的gems，更新rvm，但对我来说，解决方案似乎是更新rubygems。

gem update --system

Answer 3

使用下面的命令从gem列表中删除StringIO。它对我有效，我希望它也能解决你的问题。

gem uninstall stringio