[ns] Problem running wireless script

[Alexandra Cioroianu]

Hello everybody!
 I am trying to run the first wireless script, simple-wireless.tcl and i get a starnge error,ahich i can't solve.Here is the output:
 num_nodes is set 2
 invalid command name "-topoInstance"
     while executing
 "-topoInstance $topo \ "
     (file "simple-wireless1.tcl" line 97)
 
 Anybody knows how this can be solved?Please, i need a quick answer.It's quite urgent,i need this for my graduation project.
 Regards, Alexandra
 
		
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