ns-2.33 with mobiwan error

i tried to patch mobiwan with ns-2.33 and after that when i run any tcl script it gives me an error:

[riaz@riaz new_project]$ can't read "EnableHierRt_": no such variable
> (Object set line 1)
> invoked from within
> "Simulator set EnableHierRt_"
> (procedure "_o10" line 10)
> (Node attach line 10)
> invoked from within
> "$node attach $agent"
> (procedure "_o3" line 2)
> (Simulator attach-agent line 2)
> invoked from within
> "$ns_ attach-agent $n0 $udp0"
> (file "packetsend.tcl" line 18)
> [riaz@riaz new_project]$


please help me to resolve this... thanks in anticipation