/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:55：来自/ usr / local / lib / site_ruby的未初始化常量ActiveSupport :: Dependencies :: Mutex（NameError） /1.8/rubygems/custom_require.rb:55:in gem_original_require' from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:55:in require'来自/ usr / local / lib /的/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support.rb:56 site_ruby / 1.8 / rubygems / custom_require.rb:55:in gem_original_require' from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:55:in require'from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/bin/../lib/rails_generator.rb:28 from / usr / local / lib / site_ruby / 1.8 / rubygems / custom_require.rb:55:in gem_original_require' from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:55:in require ' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/bin/rails:14 from /usr/bin/rails:19:in `load' from / usr / bin / rails：19