Milter problem

Hello.

I have a plesk installation since plesk 9. I am now on obsidian.

I have a left problem in postfix.

I have this in my mail logs:

"warning: connect to Milter service unix:/var/run/spamass-milter/postfix/sock: No such file or directory"

And effectively, i haven't any spamass-milter folder in /var/run

what should i do? reinstall spamassasin only? (suppress and reinstall it)

anything else?

Thanks.