NoMethodError: on migrate with utf8 character


i have this message
NoMethodError: undefined method `ord’ for 0:Fixnum: SET NAMES ‘utf8’

when i use the command rake db:migrate

Have you an idea ?

here my files :


My config :
Windows XP PRO SP3
wamp 2.0 with mysql 5.0.51b
apatana 2.0
rails 2.3.2
ruby server 1.8.6
rubygems 1.3.5