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Problem with RSVP



Hello

Has anybody encountered the problem with RSVP and ns2 that you keep getting the 
error message:

invalid command name "Queue/intserv"
    while executing
"Queue/intserv WFQ RSVPLink Param Null CL create _o36 "
    invoked from within
"catch "$className create $o $args" msg"
    (procedure "new" line 3)
    invoked from within
"new Queue/$qtype"
    ("default" arm line 2)
    invoked from within
"switch -exact $qtype {
ErrorModule {
if { [llength $args] > 0 } {
set q [eval new $qtype $args]
} else {
set q [new $qtype Fid]
}
}
intserv {
set qtyp..."
    (procedure "_o3" line 25)
    (Simulator simplex-link line 25)
    invoked from within
"$self simplex-link $n1 $n2 $bw $delay $type"
    (procedure "_o3" line 9)
    (Simulator duplex-link line 9)
    invoked from within
"$self  duplex-link $n1 $n2 $bw $pd "intserv $sched $signal $adc $args""
    (procedure "_o3" line 2)
    (Simulator duplex-intserv-link line 2)
    invoked from within
"$self duplex-intserv-link $n1 $n2 $bw $delay WFQ RSVPLink $adc $est CL"
    (procedure "_o3" line 2)
    (Simulator duplex-rsvp-link line 2)
    invoked from within
"$ns duplex-rsvp-link $n0 $n1 1Mb 1s 0.3 50 5000 Param Null"
    (file "tcl/ex/rsvp/rsvp_conf.tcl" line 42)
    

? And could anybody solve it? 
Thanks for the help!

Reto