尝试运行 Command Rails Server(Ruby on Rails)

im 试图开始使用 rails。我做了一个 rails 项目，现在我试图启动服务器但得到了这个。

C:UsersHomeDocumentsSitessimple_cms>rails server
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64-mingw32/lib/mysql2/mysql2.rb:2:in `require': cannot load such file -- mysql2/2.2/mysql2 (LoadError)
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64-mingw32/lib/mysql2/mysql2.rb:2:in `<top (required)>'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64-mingw32/lib/mysql2.rb:31:in `require'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64-mingw32/lib/mysql2.rb:31:in `<top (required)>'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.2/lib/bundler/runtime.rb:76:in `require'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.2/lib/bundler/runtime.rb:72:in `each'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.2/lib/bundler/runtime.rb:72:in `block in require'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.2/lib/bundler/runtime.rb:61:in `each'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.2/lib/bundler/runtime.rb:61:in `require'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.2/lib/bundler.rb:134:in `require'
    from C:/Users/Home/Documents/Sites/simple_cms/config/application.rb:7:in `<top (required)>'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:78:in `require'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:78:in `block in server'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:75:in `tap'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:75:in `server'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

我的 gemfile 有 gem 'mysql2'， '~> 0.3.18'

视窗 7

红宝石版本 2.2.1

导轨 4.2.1

mySql 服务器版本 5.6.24

编辑：找不到适合我的解决方案，所以我安装了不同版本的导轨并成功了。

确保您已使用 bundle install 安装了 gem mysql2并且bundle install已返回成功安装。

@James，这个问题已经提出，所以请点击这些链接，希望这对你有所帮助。

1）错误"...无法加载这样的文件 -- mysql2/2.0/mysql2 （LoadError）"。在带有 Ruby 2.0.0 的 Windows XP 上

2） Ruby on Rails - 无法加载这样的文件 - mysql2/2.2/mysql2 （LoadError）

3） https://github.com/bundler/bundler/issues/3456

尝试更改

gem 'mysql2', '~> 0.3.18'

自

gem 'mysql2', '~> 0.3.11'

我认为与Windows的最大兼容版本是0.3.11。然后再次运行bundle install

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