[ns] error in modification to compute_routes

[Mahesh <mahesh@cs.iitm.ernet.in>]

Hi seniors,
	I have modified the code in the compute_routes function in
route.cc file. I'm able to compile the code successfully. But when I run
my tcl script the following errror occuring. When I undo the
modifications, i'm able to run the script. Please help me in this regard.
The error statement is attached here:

*******************************************************************

--- Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl) ---
        _o12: no target for slot -1
        _o12 type: Classifier/Hash/Dest
content dump:
classifier _o12
        0 offset
        0 shift
        2147483647 mask
        1 slots
                slot 0: _o104 (Classifier/Port)
        -1 default
---------- Finished standard no-slot{} default handler ----------

**********************************************************************
Thanks in Advance,

Regards,
Mahesh.