[ns] (hier-rtg-100.tcl) doesnt run!?

[feel2chat]

Hi,

Each time I run the script hier-rtg-100.tcl (which comes with ns-allinone)
it gives me the following error, I wonder whats the problem??

=============
Sim.: utime/stime: 147 9        stack/heap: -6976 1892352
Creating hierarchical nodes..
0...Creating links 0...

    (_o3 cmd line 1)
    invoked from within
"_o3 cmd duplex-link-of-interfaces _o14 _o614 5Mb 410ms DropTail"
    invoked from within
"catch "$self cmd $args" ret"
    invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
    (procedure "_o3" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$ns duplex-link-of-interfaces $n(0) $n(75) $linkBW 410ms DropTail"
    (procedure "create-hier-topology" line 126)
    invoked from within
"create-hier-topology $linkBW"
    (file "hier-rtg-100.tcl" line 15)
=================

Any hints or ideas in solving this annoying problem will be appreciated..

Thank you,
Zee