this utility is apparently not really that handy!!

I try....

Code:
C:\>trcasst -s d:\oracle\ora81\network\trace\sqlnet.trc

Trace Assistant Utility for 32-bit Windows: Version 8.1.6.0.0 - Production on 15-AUG-2002 12:29:30

(c) Copyright 1997 Oracle Corporation.  All rights reserved.

    *************************************************************************
    *                        Trace  Assistant  Tool                         *
    *                                TRCASST                                *
    *************************************************************************

TNS-04206: Trace Assistant Internal ERROR: Packet Type
Any clues how to resolve it?
I couldn't any documentation of that error!!!