[ns] can't read "Node_(20)": no such variable

[Mahamadou HAMIDINE]

 Hi Ns-users,
please can somebody help me solve this probem, i am using ns-2.29 with red
hat. i need the solution urgently cos i am working on my thesis which i have
to submit the first draft end of this april 2009. Thanks
Starting Simulation...

can't read "Node_(20)": no such variable

while executing

"return $Node_($id)"

(procedure "_o3" line 3)

(Simulator get-node-by-id line 3)

invoked from within

"$self get-node-by-id [lindex $L 0]"

(procedure "_o3" line 14)

(Simulator compute-hier-routes line 14)

invoked from within

"$self compute-hier-routes "

invoked from within

"if [Simulator hier-addr?] {

$self compute-hier-routes

} else {

$self compute-flat-routes

}"

(procedure "_o3" line 2)

(Simulator compute-routes line 2)

invoked from within

"[Simulator instance] compute-routes"

(procedure "Agent/rtProto/Static" line 2)

(Agent/rtProto/Static init-all line 2)

invoked from within

"Agent/rtProto/Static init-all"

invoked from within

"if [info exists rtprotos_] {

foreach proto [array names rtprotos_] {

eval Agent/rtProto/$proto init-all $rtprotos_($proto)

}

} else {

Agent/rtProto/St..."

(procedure "_o1290" line 3)

(RouteLogic configure line 3)

invoked from within

"[$self get-routelogic] configure"

(procedure "_o3" line 5)

(Simulator run line 5)

invoked from within

"$ns_ run"

(file "scen-20-10AODV.tcl" line 391)(file "scen-20-10AODV.tcl" line 391

HAMIDINE Mahamadou (¹þÃ×µÏ)
Dept.of Electronic and Information Engineering
Huazhong University of Science and Technology ( »ªÖпƼ¼´óѧ )
430074, Wuhan
Mobile: +86 1320 716 2323
Room:  +86 2787 545 960
HUBEI Province,
P.R. CHINA
E-Mails: hamidine2000 at gmail.com; hamidine2000 at yahoo.com;
hamidine2000 at hotmail.com