'Rails server' <- does not work -

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i new rails. asked make improvements existing project. downloaded heroku. uses ruby "1.8.7", rvm have project's directory. managed bundle update , bundle install. try 'rails server' , error messages:

/home/jacek/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:55: uninitialized constant activesupport::dependencies::mutex (nameerror)   /home/jacek/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.5/lib/active_support.rb:56:in `require'   /home/jacek/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.5/lib/active_support.rb:56   /home/jacek/.rvm/gems/ruby-1.8.7-p371/gems/rails-2.3.5/bin/../lib/rails_generator.rb:28:in `require'   /home/jacek/.rvm/gems/ruby-1.8.7-p371/gems/rails-2.3.5/bin/../lib/rails_generator.rb:28   /home/jacek/.rvm/gems/ruby-1.8.7-p371/gems/rails-2.3.5/bin/rails:14:in `require'   /home/jacek/.rvm/gems/ruby-1.8.7-p371/gems/rails-2.3.5/bin/rails:14   /home/jacek/.rvm/gems/ruby-1.8.7-p371/bin/rails:19:in `load'   /home/jacek/.rvm/gems/ruby-1.8.7-p371/bin/rails:19   /home/jacek/.rvm/gems/ruby-1.8.7-p371/bin/ruby_noexec_wrapper:14

how can solve problem? thank you!

jacek

sudo gem update --system

worked me :-) details have @ ruby forum

also link in comment uninitialized constant activesupport::dependencies::mutex (nameerror) solution source.


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