Urgent! What I do wrong?

[K Sun <ksun@essex.ac.uk>]

Hello,
     A problem I met is:
There is a new file "ns-rsvp.tcl". In this file, a instproc 
"duplex-rsvp-link" has been defined and I have appended "source 
ns-rsvp.tcl" to "ns-lib.tcl".

    However, the error information is:

warning: Flag variable Simulator::NumberInterfaces_ 	discontinued.
	 Setting (or not) this variable will not affect the simulations.
_o3: unable to dispatch method duplex-rsvp-link
    while executing
"$ns duplex-rsvp-link $n0 $n1 1Mb 1s 0.3 50 5000 Param Null"
    (file "./tcl/ex/rsvp/rsvp_conf.tcl" line 43)

I can not understand why the instproc "duplex-rsvp-link" can not be 
recongnised?
 
   In "ns-rsvp.tcl", there are:
....
..
Simulator instproc duplex-rsvp-link { n1 n2 bw delay res signal lim adc est } {
	$self duplex-intserv-link $n1 $n2 $bw $delay WFQ RSVPLink $adc $est CL
	$self setup-rsvp-link $n1 $n2 $bw $res $signal $lim
	$self setup-rsvp-link $n2 $n1 $bw $res $signal $lim
}

   I am anxious for this error.

   By the way, a simple question is what is wrong with define 
"Numberinterfaces" in this way: "Simulator set NumberInterfaces_ 1"?

   Hope somebody may give me advice as soon as possible!

   Many thanks,

   Sun Kai