[ns] can some one help me to over come this error in ns2

[dhaya nithi]

hi friends,


  i encountered the following problem while creating node movement for
wireless scenario


./setdest -n 20 -p 2.0 -s 10.0 -t 200 -x 500 -y 500 > scen-20-test
setdest: setdest.cc:595: void Node::RandomSpeed(): Assertion `speed != 0.0'
failed.
Aborted



can some one please help me


thanks

-- 
Regards,
dhayanithi.