Backup Utilities Error

[skech]

I use Win 2003 , 6.5.2 and install all hotfixes.
I insstal backup utilities, and error on all domains

Unable to assign DomainControlForm object: Unable to addVars: domain_bu failed: The backup utilites require PSA 6.5.x to be installed

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0: C:\Program Files\SWsoft\Plesk\admin\htdocs\domains\dom_ctrl.php3:160 psaerror(string "Unable to assign DomainControlForm object: Unable to addVars: domain_bu failed: The backup utilites require PSA 6.5.x to be installed")