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Error while running example in tcl script


I am working on ns-2.33 on linux RedHat 9.0 machine. I am trying to run an example for FTP application on wired network having 4 nodes. When I run using ns sample_2.tcl I get following error:

invalid command name "Queue/ms"
while executing
"Queue/ms create _o22 DropTail"
invoked from within
"catch "$className create $o $args" msg"
invoked from within
"if [catch "$className create $o $args" msg] {
if [string match "__FAILED_SHADOW_OBJECT_" $msg] {
delete $o
global errorInfo
error "class $..."
(procedure "new" line 3)
invoked from within
"new Queue/$qtype $args"
("default" arm line 5)
invoked from within
"switch -exact $qtype {
ErrorModule {
if {[llength $args] > 0} {
set q [eval new $qtype $args]
else {
set q[new $qtype Fid]
intserv {
set qtyp..."
(procedure "_o3" line 14)
invoked from within
"$ns simplex-link $n0 $n2 5Mb 2ms DropTail"
(file "sample_2.tcl" line 13)

I don't understand how to deal with this error. Please help me with this. It is urgent! Please!

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