Ruby on rails 3 新rails项目错误rails 3

我在启动一个新应用程序时从来没有遇到过问题，但今天我在尝试运行rails new murphy时遇到了一个错误

/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:59:in `gem_original_require': no     such file to load -- active_support/core_ext/object/singleton_class (LoadError)
from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:59:in `require'
from /usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta2/lib/rails/generators.rb:6
from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:55:in `gem_original_require'
from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:55:in `require'
from /usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta2/lib/rails/commands/application.rb:10
from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:55:in `gem_original_require'
from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:55:in `require'
from /usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta2/bin/rails:30
from /usr/local/bin/rails:19:in `load'
from /usr/local/bin/rails:19

---

看起来您正在使用Rails 3.0测试版。尝试使用Rails 3.0.9

gem install rails -v3.0.9

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看起来已经安装了Rails的3.0测试版。正如Chris Ledet提到的，您应该升级到最新的3.0.x版本。我还想建议您切换到使用。能够管理单个gemset非常值得花费安装时间。