遇到undefined method `alias_method_chain' for ActiveRecord问题

NoMethodError 
undefined method `alias_method_chain' for ActiveRecord::Validations::ClassMethods:Module
RAILS_ROOT: ./script/../config/..

Application Trace | Framework Trace | Full Trace 
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/gettext-1.9.0-mswin32/lib/gettext/active_record.rb:87
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/gettext-1.9.0-mswin32/lib/gettext/rails.rb:438
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:33:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:33:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
#{RAILS_ROOT}/app/controllers/application.rb:3
-e:4:in `load'
-e:4
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/gettext-1.9.0-mswin32/lib/gettext/active_record.rb:87
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/gettext-1.9.0-mswin32/lib/gettext/rails.rb:438
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:33:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:33:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:140:in `load'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:140:in `load'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:56:in `require_or_load'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:30:in `depend_on'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:85:in `require_dependency'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:69:in `prepare_application'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:37:in `dispatch'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in `handle_dispatch'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in `service'
c:/softsetup/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
c:/softsetup/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in `dispatch'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
script/server:3
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/gettext-1.9.0-mswin32/lib/gettext/active_record.rb:87
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/gettext-1.9.0-mswin32/lib/gettext/rails.rb:438
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:33:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:33:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
#{RAILS_ROOT}/app/controllers/application.rb:3
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:140:in `load'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:140:in `load'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:56:in `require_or_load'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:30:in `depend_on'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:85:in `require_dependency'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:69:in `prepare_application'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:37:in `dispatch'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in `handle_dispatch'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in `service'
c:/softsetup/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
c:/softsetup/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'
c:/softsetup/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in `dispatch'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
c:/softsetup/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
c:/softsetup/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
script/server:3
-e:4:in `load'
-e:4
This error occured while loading the following files:
   application.rb
   gettext/rails
   gettext/active_record
 

Application error 
Change this error message for exceptions thrown outside of an action (like in Dispatcher setups or broken Ruby code) in public/500.html