我使用Windows的Railsinstaller在lal上安装了Ruby（我有Windows 10）当我尝试运行第一个应用程序时，我会在Rails Server之后出现错误：
C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.5-x86-mingw32/lib/nokogiri.rb:29:in `require': cannot load such file -- nokogiri/nokogiri (LoadError)
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.5-x86-mingw32/lib/nokogiri.rb:29:in `rescue in <top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.5-x86-mingw32/lib/nokogiri.rb:25:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/loofah-2.0.1/lib/loofah.rb:3:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/loofah-2.0.1/lib/loofah.rb:3:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/rails-html-sanitizer-1.0.1/lib/rails-html-sanitizer.rb:2:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/rails-html-sanitizer-1.0.1/lib/rails-html-sanitizer.rb:2:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/sanitize_helper.rb:3:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/sanitize_helper.rb:3:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/text_helper.rb:32:in `<module:TextHelper>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/text_helper.rb:29:in `<module:Helpers>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_tag_helper.rb:8:in `<module:ActionView>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_tag_helper.rb:6:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_helper.rb:4:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_helper.rb:4:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers.rb:50:in `<module:Helpers>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers.rb:4:in `<module:ActionView>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers.rb:3:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/legacy_asset_tag_helper.rb:7:in `<module:LegacyAssetTagHelper>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/legacy_asset_tag_helper.rb:6:in `<module:Rails>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/legacy_asset_tag_helper.rb:4:in `<module:Sprockets>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/legacy_asset_tag_helper.rb:3:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/helper.rb:45:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/helper.rb:45:in `<module:Helper>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/helper.rb:7:in `<module:Rails>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/helper.rb:6:in `<module:Sprockets>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/rails/helper.rb:5:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/railtie.rb:6:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.2/lib/sprockets/railtie.rb:6:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/rails/railtie.rb:2:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/rails/railtie.rb:2:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:11:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/rails.rb:11:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass-rails.rb:1:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.13.6/lib/bundler/runtime.rb:91:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.13.6/lib/bundler/runtime.rb:91:in `block (2 levels) in require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.13.6/lib/bundler/runtime.rb:86:in `each'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.13.6/lib/bundler/runtime.rb:86:in `block in require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.13.6/lib/bundler/runtime.rb:75:in `each'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.13.6/lib/bundler/runtime.rb:75:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.13.6/lib/bundler.rb:106:in `require'
from C:/Sites/todo/config/application.rb:7:in `<top (required)>'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `require'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
我该如何修复它？错误的原因是什么？
尝试在Cygwin或您在环境中使用的任何CLI运行$ gem install nokogiri。这应该为您安装nokogiri GEM，并（希望）导致错误消失。