[ns] NAM error

[moinul islam]

i am using cygwin-1.5.25 and ns-allinone-2.29.2 in windows vista.fut i got the following error while trying to run nam
Moinul at Moinul-PC /usr/local
$ nam out.nam
nam: 
[code omitted because of length]
: no event type or button # or keysym
    while executing
"bind Listbox <MouseWheel> {
%W yview scroll [expr {- (%D / 120) * 4}] units
}"
    invoked from within
"if {[string equal [tk windowingsystem] "classic"]
|| [string equal [tk windowingsystem] "aqua"]} {
bind Listbox <MouseWheel> {
%W yview scroll [expr {..."