Navision Server Error Event 109

Hello. My Navision 2.0 server used to shut down everyday near 1 AM with this error (see below) The description for Event ID ( 109 ) in Source ( LIVE ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. The following information is part of the event: The system failed to retrieve the object from Active Directory. The system returned the following error: 0x80005000 Contact your system administrator or your vendor for support. What is the problem. And where I could see the Event Descrpition. And what Navision 2.0 is looking for in AD??? Thanx in advance