problem with my ns-allinone-2.26

[deb-worm]

hi ! i'm new to forum..
i have a problem with my ns-allinone-2.26 in Ubuntu10.10
my gcc version is 3.3 !

i have installed the ns-2.26 . when i type nam , nam opens , but when i write a simple script such as this :

#Create a simulator object
set ns [new Simulator]
#Open the nam trace file
set nf [open out.nam w]
$ns namtrace-all $nf
#Define a 'finish' procedure
proc finish {} {
global ns nf
$ns flush-trace
#Close the trace file
close $nf
#Execute nam on the trace file
exec nam –a out.nam &
exit 0
}
#Create two nodes
set n0 [$ns node]
set n1 [$ns node]
#Create a duplex link between the nodes
$ns duplex-link $n0 $n1 1Mb 10ms DropTail
#Call the finish procedure after 5 seconds of simulation time
$ns at 5.0 "finish"
#Run the simulation
$ns run

and try to run it terminal shows this :

Cannot connect to existing nam instance. Starting a new one...

nam: Unable to open the file "–a.nam"


what should i do ??

help me..

[MikeTbob]

Hello and Welcome.
Not to be a butthead or anything but did you try a Google search? It yields a lot of hits and I bet if you look hard enough you can find the answer all by yourself.
Google Search

Have you tried a newer version of ns-allinone?
Did you read the system requirements and dependencies?