[ns] plz help:ns-2 error

[moinul islam]

plz help me for the following error.i am using cygwin 1.5.25 and ns-allinone-2.29.2 on windows vista machine
 
Moinul at Moinul-PC /usr/local
$ ns out.nam
invalid command name "V"
    while executing
"V -t * -v 1.0a5 -a 0"
    (file "out.nam" line 1)