question on ns2 QueueMonitors

[Subramaniam Vincent]

Hi,

I am trying to set up a Queuemonitor using this command, and its fails.

% ns agexp.tcl

no value given for parameter "qtrace" to "_o1"
    while executing
"$ns monitor-queue $n0 $n1"
    invoked from within
"set qmon [$ns monitor-queue $n0 $n1]..."

The command is "set qmon [$ns monitor-queue $n0 $n1]".

Can someone tell me what I am doing wrong, of if there anything else I
need to do ? Thanks.

Vince