Ruby on rails 3 Can'；t在Windows上使用Cygwin启动新的应用程序RoR

我一直在关注这个。当我在第3章中启动新应用程序时，我遇到了gemjson问题。我想我应该打开应用程序重新开始。现在我甚至不能启动一个新的应用程序。这是我得到的错误

$ rails new sample_app2
/usr/lib/ruby/site_ruby/1.8/rubygems/dependency.rb:247:in `to_specs': Could not find json (~> 1.4) amongst [actionmailer-3.2.2, actionpack-3.2.2, activemodel-3.2.2, activerecord-3.2.2, activeresource-3.2.2, activesupport-3.2.2, addressable-2.2.7, arel-3.0.2, builder-3.0.0, bundler-1.1.3, bundler-1.1.2, coffee-rails-3.2.2, coffee-script-2.2.0, coffee-script-source-1.2.0, diff-lcs-1.1.3, erubis-2.7.0, execjs-1.3.0, heroku-2.22.0, heroku-2.21.3, hike-1.2.1, i18n-0.6.0, journey-1.0.3, jquery-rails-2.0.1, json_pure-1.6.6, launchy-2.1.0, mail-2.4.4, mime-types-1.18, multi_json-1.2.0, multi_json-1.1.0, netrc-0.7.1, polyglot-0.3.3, rack-1.4.1, rack-cache-1.2, rack-ssl-1.3.2, rack-test-0.6.1, rails-3.2.2, railties-3.2.2, rake-0.9.2.2, rdoc-3.12, rest-client-1.6.7, rspec-2.9.0, rspec-core-2.9.0, rspec-expectations-2.9.0, rspec-mocks-2.9.0, rspec-rails-2.9.0, rubyzip-0.9.6.1, sass-3.1.15, sass-rails-3.2.5, sprockets-2.3.1, sprockets-2.1.2, sqlite3-1.3.5, sqlite3-ruby-1.3.3, thor-0.14.6, tilt-1.3.3, treetop-1.4.10, tzinfo-0.3.32, uglifier-1.2.3] (Gem::LoadError)
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:772:in `activate_dependencies'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:761:in `each'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:761:in `activate_dependencies'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:745:in `activate'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:775:in `activate_dependencies'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:761:in `each'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:761:in `activate_dependencies'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/specification.rb:745:in `activate'
    from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:1211:in `gem'
    from /usr/bin/rails:18

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我已经注意到以前关于安装DevKit的建议，但我不确定这是否是Cygwin的正确做法？？？

Ruby安装程序对我来说工作得更好。Cygwin提出了很多问题。这可能主要是用户的错误，但无论我走到哪里，我都会碰到砖墙

这里有一个关于安装RubyonRails的很棒的教程（包括下载），包括sqlite、bundler、git和devkit

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我安装cygwin。进入Cygwin后，我使用命令“gem install rails sqlite3 ruby”安装了rails。最后我离开Cygwin，使用了ruby安装程序。从那以后，我就没有遇到过任何安装问题。