ERROR: PleskFatalException

[certis]

Hey guys, i'm running FreeBSD 6.1 with Plesk 8.1- both fresh installs. Trying to create a domain for a client and I'm running into this error:

Failed domain creation: Unable to update domain data: Failed mail post-configuration: Can't create mail domain servie: mailManager->addDomain() failed: mailmng failed: Empty error message from utility.

0: /usr/local/psa/admin/htdocs/domains/create_domain.php:15

Not sure whats going on here, but any help is greatly appreciated.