Akismetor spam always true

Hi all

I implemented the gem akismetor in my rails 3 application.
I followed Ryan’s railscast (ep65).

But the method Akismetor.spam? always return true. So it always
the comment as a spam. Even when I test with:

commenter: Rebecca
comment: awesome blog, keep going !

I also checked with “spam-123” and at least return true too…

Any ideas?