[ns] nam problem

[verotiana rabarijaona]

Hi,

I can't use nam on ns2. Everytime I try to use it either from the terminal or a 
tcl script the following error occur:

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 {[tk windowingsystem] eq "classic" || [tk windowingsystem] eq "aqua"} {
bind Listbox <MouseWheel> {
%W yview scroll [expr {- (%D)}] units
}
bind Li..."

I've tried to reinstall ns2 but the the problem remains so I don't know what to 
do....
anybody can help?

Vero