命令“rails server”不起作用或 Rails 服务器命令不起作用

Question

当我运行“rails server”或“rails s”时出现错误。

您好，我正在学习 Rails，但出现错误

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)

---

我之前运行时的命令

rails g controller home index           

ubuntu版

21.10

我的ruby版

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

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谢谢你帮助我

Answer 1

您的 ruby​​ 版本2.7.4和文件夹 rails s 用于 gems /var/lib/gems/2.7.0/会向我表明某种版本不匹配。

您的Gemfile?指明了哪个 ruby​​ 版本Gemfile?

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（和全局）的 Ruby 版本处理更加容易。

你可以在 gorails 中查看这篇文章来安装 rbenv：在 Ubuntu#rbenv 上安装 Ruby On Rails

小心：如果您选择安装rbenv请记住有多个版本管理器是一个坏主意，所以不要意外地继续安装rvm 。 这些并不意味着共存于同一个系统中。 只跟进这部分：

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

rbenv global 3.0.2 （与您安装的版本相同）

ruby -v

在这些之后，请重新运行文件夹中的bundle install并尝试再次运行rails s 。 让我们知道这是怎么回事。

Answer 2

更新我的宝石后，我开始收到此错误。 我尝试卸载 ruby​​ 和我所有的 gems，更新 rvm，但对我来说，解决方案似乎是更新 ruby​​gems。

gem update --system

Answer 3

使用以下命令从您的 gem 列表中删除 StringIO。 它对我有用，我希望它也能解决你的问题。

gem uninstall stringio