Error on rake command

Have you an idea about this error message开发者_高级运维 when i run the rake db:migrate command under Aptana ?

rake aborted! NoMethodError: undefined method `ord' for 0:Fixnum: SET SQL_AUTO_IS_NULL=0

Thanks

Here My Config : Windows XP PRO SP2 Wamp 2.0 Aptana 2.0.4 RubyGems 1.3.5 Ruby 1.8.6

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Check your log with [rake db:migrate --trace] to see where it's breaking. You probably tried to use an invalid type in your migrations file.