[ns] help regarding nam in ns on fedora 10

[lets go ok]

hi,
m running ns-2.29 in fedora core 10. after installation when i try to run s=
ome tcl script from ns-tutorial folder i get the following error.
i cant figure out why. plz help me in this regard.
=A0
$nam:
[code omitted because of length]
: no event type or button # or keysym
=A0 =A0 while executing
"bind Listbox <MouseWheel> {
%W yview scroll [expr {- (%D / 120) * 4}] units
}"
=A0 =A0 invoked from within
"if {[tk windowingsystem] eq "classic" || [tk windowingsystem] eq "aqua"} {
bind Listbox <MouseWheel> {
%W yview scroll [expr {- (%D)}] units
}