[ns] setdest error

[Bello Lawal]

Hi all,

while running setdest script  it generates the following error.
  Below is the error it generates after execution of the ./setdest -n 5 -p 1.0 -s 5.0 -t 100 -x 300 -y 300 > scen-5-test

Error Messege
assertion "speed !=0.0" failed: file "setdest.cc", line 595 then ****fatal error - called with threadlist_ix -1 Hang.
Pls can any one help me 

Thanks