raise_if_conflicts＆＃39;：无法激活rails-dom-testing

Question

我第一次在轨道上安装了ruby。当我尝试运行服务器时，发生以下错误。我搜索了很多但找不到解决方案。我已经卸载了nokogiri 1.6.6，它无法在Windows上运行。之后我安装了1.8.+版本。现在我正面临这个错误。

C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:2112:in raise_if_conflicts: Unable to activate rails-dom-testing-2.0.1, because nokogiri-1.8.0-x86-mingw32 conflicts with nokogiri (~> 1.6.0) (Gem::ConflictError)
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1280:in activate
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1314:in block in activate_dependencies
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1300:in each
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1300:in activate_dependencies
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1282:in activate
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1314:in block in activate_dependencies
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1300:in each
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1300:in activate_dependencies
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/specification.rb:1282:in activate
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:67:in block in gem
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:66:in synchronize
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:66:in gem
        from C:/RailsInstaller/Ruby2.2.0/bin/rails:22:in <main>