Login Script Error

We are running Novell Netware 3.12 after the login in script there is an error which pops up in a Dos box which says: You have performed an illegal operation. I then click details and and it says: The program encountered an ivalid page exception.Fault Location: 0028:C02B8EE8 Faulting Component: IFSMGR(04) + 00013704 Interrupts in service: None