ubuntu ruby on rails /gems/activesupport-2.3.2/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)


1. go to config/boot.rb
2. add require 'thread' below:
    RAILS_ROOT = "#{File.dirname(__FILE__)}/.." unless defined?(RAILS_ROOT)
    require 'thread'

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