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[ns] Problems with MAKE-LAN



When I try to run a tcl with LANS, the following error messages is dispalyed :
 
"error while reading last line of out.nam".
 
Does anybody knows what have I done wrong ??
 
Here is my tcl

#

# Created using Matthew B. Doar's `tiers` topology generator with parameters:

# tiers 1 1 1 1 1 10 1 1 1 1 1 856566616

#

#

proc create_net {} {

global ns_

global nodes_

global rt_

set ns_ [new Simulator]

set i 0

while {$i < 2} {

set nodes_($i) [$ns_ node]

incr i

}

$ns_ make-lan "$nodes_(0) $nodes_(1) " 1000 0 LL Queue/DropTail Mac/802_3

}

create_net

 

#Open the nam trace file

set nf [open out.nam w]

$ns_ namtrace-all $nf

 

proc finish {} {

global ns_ nf

$ns_ flush-trace

#Close the trace file

close $nf

#Execute nam on the trace file

exec nam out.nam &

exit 0

}

#Call the finish procedure after 2 seconds of simulation time

$ns_ at 2.0 "finish"

#Run the simulation

$ns_ run