From: "Rajesh B." Date: 2011-03-05T18:20:43+09:00 Subject: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError) Hi all i have installed rails 2.3.8 in my machine. after the installation when i create a new project it gives the error "uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)". can any one please help i am new to apple mac os x. my os version is mac 10.6.3 This is the error : rajeshs-macbook:Desktop rajesh$ ruby --version ruby 1.8.7 (2009-06-08 patchlevel 173) [universal-darwin10.0] rajeshs-macbook:Desktop rajesh$ rails --version Rails 2.3.8 rajeshs-macbook:Desktop rajesh$ rails demo /Library/Ruby/Gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError) from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:49:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:49:in `require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.8/lib/active_support.rb:57 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:49:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:49:in `require' from /Library/Ruby/Gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:31 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:49:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:49:in `require' from /Library/Ruby/Gems/1.8/gems/rails-2.3.8/bin/rails:15 from /usr/bin/rails:19:in `load' from /usr/bin/rails:19 Thanks all Rajesh -- Posted via http://www.ruby-forum.com/.