Nam (network animator) with ns2.31 on fedora 12

Hi,
I'm using fedora 12. I've installed ns2.31 but there is a problem with nam which does not run and the following error message appears
[root@localhost ex]# ns tcpapp.tcl
running nam...
[root@localhost ex]# nam:
[code omitted because of length]
: no event type or button # or keysym
while executing
"bind Listbox {
%W yview scroll [expr {- (%D / 120) * 4}] units
}"
invoked from within
"if {[tk windowingsystem] eq "classic" || [tk windowingsystem] eq "aqua"} {
bind Listbox {
%W yview scroll [expr {- (%D)}] units
}
bind Li..."
ns tcp-et.tcl
Filtering ...
ns: finish: couldn't execute "tclsh8.0": no such file or directory
while executing
"exec tclsh8.0 ../nam/bin/namfilter.tcl out.nam"
(procedure "finish" line 9)
invoked from within
"finish"