When I start the server in Ruby On Rails it exits as soon as it starts and sometimes doesn't even start, just gives an error

问题

This is the error message in Windows:

   C:\Users\USER\Sites\new_cms>rails s
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2-x64-mingw32/lib/nokogir
.rb:29:in `require': cannot load such file -- nokogiri/nokogiri (LoadError)
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2-x64-mingw3
/lib/nokogiri.rb:29:in `rescue in <top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.2-x64-mingw3
/lib/nokogiri.rb:25:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/loofah-2.0.1/lib/loofah.rb:
:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/loofah-2.0.1/lib/loofah.rb:
:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rails-html-sanitizer-1.0.2/
ib/rails-html-sanitizer.rb:2:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rails-html-sanitizer-1.0.2/
ib/rails-html-sanitizer.rb:2:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/sanitize_helper.rb:3:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/sanitize_helper.rb:3:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/text_helper.rb:32:in `<module:TextHelper>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/text_helper.rb:29:in `<module:Helpers>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/text_helper.rb:6:in `<module:ActionView>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/text_helper.rb:4:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/form_tag_helper.rb:18:in `<module:FormTagHelper>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/form_tag_helper.rb:14:in `<module:Helpers>'
        from C:/Ruby22-x64/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:/Ruby22-x64/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:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/form_helper.rb:4:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers/form_helper.rb:4:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers.rb:50:in `<module:Helpers>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers.rb:4:in `<module:ActionView>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action
view/helpers.rb:3:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/legacy_asset_tag_helper.rb:7:in `<module:LegacyAssetTagHelper>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/legacy_asset_tag_helper.rb:6:in `<module:Rails>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/legacy_asset_tag_helper.rb:4:in `<module:Sprockets>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/legacy_asset_tag_helper.rb:3:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/helper.rb:45:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/helper.rb:45:in `<module:Helper>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/helper.rb:7:in `<module:Rails>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/helper.rb:6:in `<module:Sprockets>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/rails/helper.rb:5:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/railtie.rb:6:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.2.4/lib/s
rockets/railtie.rb:6:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/r
ils/railtie.rb:2:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/r
ils/railtie.rb:2:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/r
ils.rb:11:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass/r
ils.rb:11:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass-r
ils.rb:1:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.1/lib/sass-r
ils.rb:1:in `<top (required)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/r
ntime.rb:76:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/r
ntime.rb:76:in `block (2 levels) in require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/r
ntime.rb:72:in `each'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/r
ntime.rb:72:in `block in require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/r
ntime.rb:61:in `each'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/r
ntime.rb:61:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler.r
:134:in `require'
        from C:/Users/USER/Sites/new_cms/config/application.rb:7:in `<top (requ
red)>'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/co
mands/commands_tasks.rb:78:in `require'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/co
mands/commands_tasks.rb:78:in `block in server'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/co
mands/commands_tasks.rb:75:in `tap'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/co
mands/commands_tasks.rb:75:in `server'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/co
mands/commands_tasks.rb:39:in `run_command!'
        from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/co
mands.rb:17:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

C:\Users\USER\Sites\new_cms>

回答1:

Nokogiri doesn't have binaries for Ruby 2.2.1 available for the mingw32 platform due to some problems with cross compiling Ruby 2.2.1 for the rake-compiler-dev-box.

Since Nokogiri doesn't natively compile on Windows, the only fix is to downgrade to Ruby 2.1.5. Once the next patch level of Ruby 2.2 is released hopefully the problem will be solved.