我尝试从OSX到Debian运行一个工作轨道项目。我在两个系统RVM上使用并为项目创建了相同的gemsets和rvmrc。在Debian上我只用rvm安装了ruby，没有系统安装ruby存在。
当我跳进项目文件夹时，rvm正在切换到版本1.8.7并使用项目gemset，一切看起来都很好。
但是当我启动耙子时，我得到了这个错误：
$ rake -T --trace
(in /home/i/project/src)
rake aborted!
uninitialized constant ActiveSupport::Dependencies::Mutex
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2503:in `const_missing'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:55
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/activesupport-2.3.5/lib/active_support.rb:56
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/misc.rake:18
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4:in `load'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4:in `each'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rails-2.3.5/lib/tasks/rails.rb:4
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
/home/i/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
/home/i/ws/project/src/Rakefile:10
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2383:in `load'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2383:in `raw_load_rakefile'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2017:in `load_rakefile'
/ home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2016:in `load_rakefile'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2000:in `run'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/gems/rake-0.8.7/bin/rake:31
/home/i/.rvm/gems/ruby-1.8.7-p249@project/bin/rake:19:in `load'
/home/i/.rvm/gems/ruby-1.8.7-p249@project/bin/rake:19
答案 0 :(得分：19)
对我来说，添加require'thread'也不起作用。
通过将rubygems降级为1.4.2来解决问题：
较新版本的rubygems（在我的情况下，1.8.5）和旧版本的rails（在我的情况下为2.3.5）之间存在兼容性问题
$ gem install rubygems-update -v='1.4.2'
$ gem uninstall rubygems-update -v='1.8.5'
$ update_rubygems
答案 1 :(得分：13)
我的解决方案。添加以下行：
require 'thread'
在rails项目根目录下的Rakefile的第一行。神奇地所有人都会跑; - ）
答案 2 :(得分：7)
我不久前就碰到了这个。如果你谷歌搜索它，你会发现一些博客和邮件列表帖子，建议你在require "threads"中明确地environment.rb。然而，这对我来说不起作用，但降级rubygems确实：
sudo gem update --system 1.3.7
有些帖子还提到升级到更新版本的Rails，目前在我们的案例中不是一个选项。
答案 3 :(得分：0)
你可以通过升级rails来解决它
gem install rails --version 2.3.11
或降级宝石
sudo gem update --system 1.5.3