uninitialized constant ActiveSupport:Dependencies:Mutex (NameError)

uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)

[~/projects/agideo/chaoda_eip] (master) 216h30m $ ruby script/server /home/hp/.rvm/gems/ree-1.8.7-2011.03/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)from /home/hp/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'from /home/hp/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'from /home/hp/.rvm/gems/ree-1.8.7-2011.03/gems/activesupport-2.3.4/lib/active_support.rb:56from /home/hp/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'from /home/hp/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'from /home/hp/.rvm/gems/ree-1.8.7-2011.03/gems/rails-2.3.4/lib/commands/server.rb:1from /home/hp/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'from /home/hp/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'from script/server:3

rvm install rubygems 1.4.2