Has anyone seen this error before, and know what it means and how to fix it?

5-21-2006 12:09:55 pm: NDPSM-3.1-684
Error (0) occurred while accessing the NDPS Manager database.

I haven't seen any problems in the system, and printing hasn't been affected. I searched through all the Novell forums and Google searched, as well as all the NetWare 6 documentation, but can't find anything about it. Can anyone provide any foresight into this? We've had this error three times now, with no determinable cause or effect.

We're running NDPS Manager version 3.01i; NDPS Broker version 3.0.9 on Netware 6 SP5. All of our printers are set up using iPrint with the 3.16 client.

TIA,
Chris