Error when creating node movement for wireless scenario in ns2 using setdest tool.

Example:

./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. 
Solution:

Try to use -M instead of -s for speed