MAJOR Plesk error -- why?

[JVRudnick]

I click on one of the domains in my account, and Iget this error...

Unable to check SiteAppPackage requires: Empty error message from utility.

--------------------------------------------------------------------------------
0: C:\PLESK\admin\plib\class.DomainControlForm.php:208 psaerror(string "Unable to check SiteAppPackage requires: Empty error message from utility.")
1: C:\PLESK\admin\htdocs\domains\dom_ctrl.php3:171 domaincontrolform->assign(object of type bsdomain, boolean true)


What does that mean? Why is it happening??? And how do I fix it????

;-(

Jim