Hello ns users! I have downloaded the script simple-wireless.tcl but i have problems running it. When i type "ns simple-wireless.tcl",i get the next message: num_nodes is set 2 invalid command name "-topoInstance" while executing "-topoInstance $topo \ -agentTrace ON \ -routerTrace ON \ -macTrace OFF \ -movementTrace OFF " (file "simple-wireless.tcl" line 89) I have made the changes that David Lefuste told someone to do in this script(i remember that somebody asked a similar question about this script few days ago),but i still have this problem. Please,i need a quick answer,as fast as possible.Thank you in advance! Regards, Alexandra --------------------------------- Yahoo! Mail Bring photos to life! New PhotoMail makes sharing a breeze.