Firewall Problem

[filipersimoes]

Hi, my firewall is disabling by itself. And when I try to enable the service I get this messege:

Warning: DOMDocument::loadXML() [function.loadXML]: Start tag expected, '<' not found in Entity, line: 1 in C:\Program Files\SWsoft\Plesk\admin\plib\firewallmng.php on line 54
Plesk Firewall Management

Please help!
Thanls