ASalam alikom

 I have error when I write this program

 

set ns [new Simulator]

set nf [open out.nam w]

$ns namtrace-all $nf

proc finish {} {

        global ns nf

        $ns flush-trace

        close $nf

        exec nam out.nam &

        exit 0

}

set n0 [$ns node]

set n1 [$ns node]

$ns duplex-link $n0 $n1 1Mb 10ms DropTail

$ns at 5.0 "finish"

$ns run

 

When I run this program

It give me this error

 

Ns:finish:couldn't execute "nam":

No such file or directory

     While executing

"exec nam out.nam &"

(procedure "finish" line5)

Invoked from within

"finish"

can you help me to solve this error?
gazak allah khiran 

   
  
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