[ruby-on-rails] 초기화되지 않은 상수 ActiveSupport :: Dependencies :: Mutex (NameError)

Ruby on Rails 프로젝트를 작성하려고 할 때 아래 메시지가 표시됩니다.

/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support.rb:57
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:31
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails:15
    from /usr/bin/rails:19:in `load'
    from /usr/bin/rails:19

무엇이 잘못 되었습니까? 어떻게 고치나요?

답변

require 'thread'

# Don't change this file!
# Configure your app in config/environment.rb and config/environments/*.rb
...

gem update --system 1.5.3

Updating RubyGems
ERROR:  While executing gem ... (RuntimeError)
    No gem names are allowed with the --system option

gem update --system
gem update --system 1.5.3

require 'thread'

if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.3.7')
 module Rails
   class GemDependency
     def requirement
       r = super
       (r == Gem::Requirement.default) ? nil : r
     end
   end
 end
end

sudo gem update --system 1.4.2

require 'thread'