PLESK / Spamassassin error

[easys]

When I try to acces the Spam Filter tab in the ControlPanel I Receive the follwing error;

SpamAssassin() constructor failed: Action features failed: Empty error message from utility.
---------------------- Debug Info -------------------------------
0: C:\Program Files\SWsoft\Plesk\admin\plib\common_func.php3:151
psaerror(string 'SpamAssassin() constructor failed: Action features failed: Empty error message from utility.')
1: C:\Program Files\SWsoft\Plesk\admin\htdocs\server\spamassassin.php:17


I already followed the kb's but no improvement....

Please help!