X11 errors in users .xsession_errors

Hi,

i have an user, he uses a suse linux 10.3 box with dual monitor. He has many logs in .xsession_errors like:

X Error: BadWindow (invalid Window parameter) 3
Major opcode: 20
Minor opcode: 0
Resource id: 0x2e00013

Does anyone know what this exactly means?

Thx in front for your help.

Regards

I have renewed the driver. The Failure doesnt exist now.