我得到的错误如下：
C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64-mingw32/lib/m ysql2 / mysql2.rb：2：在require'：无法加载这样的文件 - mysql2 / 2.2 / my sql2（LoadError） 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64- mingw32 / lib / mysql2 / mysql2.rb：2：in' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64- mingw32 / lib / mysql2.rb：31：in require' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/mysql2-0.3.18-x64- mingw32 / lib / mysql2.rb:31:in' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.1/lib/ bundler / runtime.rb：76：in require' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.1/lib/ bundler / runtime.rb：76：在块中（2级）in require' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.1/lib/ bundler / runtime.rb：72：in each' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.1/lib/ bundler / runtime.rb：72：in block in require' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.1/lib/ bundler / runtime.rb：61：in each' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.1/lib/ bundler / runtime.rb：61：in require' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.9.1/lib/ bundler.rb：134：in require' 来自D：/xampp/htdocs/RubyCms/config/application.rb:7:in' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib /rails/commands/commands_tasks.rb:78:in要求' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib /rails/commands/commands_tasks.rb:78:in在服务器块' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib /rails/commands/commands_tasks.rb:75:in tap' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib /rails/commands/commands_tasks.rb:75:in server' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib /rails/commands/commands_tasks.rb:39:in run_command！' 来自C：/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib /rails/commands.rb:17:in' 来自bin / rails：4：in require' 来自bin / rails：4：在'
我真的不知道出了什么问题。
非常感谢任何帮助。
答案 0 :(得分：0)
当我意外地创建了一个带有默认数据库（sqlite3）的新Rails应用程序但实际安装了mysql2时，我遇到了同样的错误。
检查您安装的数据库以及gemfile中需要的数据库。