active_support needs to require 'thread'

require 'active_support'

NameError: uninitialized constant ActiveSupport::Dependencies::Mutex
        from C:/installs/ruby-1.8.6-p388-i386-mingw32/lib/ruby/gems/
1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55
        from C:/installs/ruby-1.8.6-p388-i386-mingw32/lib/ruby/
site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from C:/installs/ruby-1.8.6-p388-i386-mingw32/lib/ruby/
site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from C:/installs/ruby-1.8.6-p388-i386-mingw32/lib/ruby/gems/
1.8/gems/activesupport-2.3.8/lib/active_support.rb:57
        from C:/installs/ruby-1.8.6-p388-i386-mingw32/lib/ruby/
site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from C:/installs/ruby-1.8.6-p388-i386-mingw32/lib/ruby/
site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from (irb):4

Thanks.

Thanks!

jeremy