The user ID was not found

Hi Experts,

When I select Admin > Task Audit / Data Audit, I'm getting the error below. I searched the net and it's a common issue, but can't seem to find a concrete answer.

The user ID was not found.
Show Details:
Error Reference Number: {7F03F2D1-AB68-4E99-AA99-0D82AA2BB531};User Name: admin@Native Directory
Num: 0x80045d01;Type: 0;DTime: 10/17/2012 1:14:58 PM;Svr: HEINEKEN;File: SystemInfoUsersActivities.cpp;Line: 616;Ver: 11.1.2.0.0.2762;
Num: 0x80045d01;Type: 0;DTime: 10/17/2012 1:14:58 PM;Svr: HEINEKEN;File: CHsvSystemInfo.cpp;Line: 2535;Ver: 11.1.2.0.0.2762;
Num: 0x80045d01;Type: 0;DTime: 10/17/2012 1:14:58 PM;Svr: HEINEKEN;File: CHFMwSystemInfo.cpp;Line: 1760;Ver: 11.1.2.0.0.2762;

Appreciate your feedbacks.