Problem with character set utf8

Hi,

I have create an empty rails project on aptana; I have manually, on PhpMyAdmin, create my database. When i run rake db:migrate under Aptana, i have this message :

rake aborted! NoMethodError: undefined method `ord' for 0:Fixnum: SET NAMES 'utf8'

Is anyone have an idea

Thanks

My config : Windows XP Pro SP3 Wamp 2.0 Aptana 2.0.4 Ruby 1.8.6