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Need Help --- Error while executing ns



Hi,
I installed ns and when I tried to execute the file srm.tcl in /tcl/ex
directory, I got the following error:
------------------------------------------------
$ ./ns ./tcl/ex/srm-adapt-req.tcl
ns: _o4 run-mcast: invalid command name "0"
    while executing
"[$link set ifacein_] set intf_label_"
    (procedure "_o51" line 3)
    (Node get-oif line 3)
    invoked from within
"$self get-oif $link"
    (procedure "_o51" line 5)
    (Node init-outLink line 5)
    invoked from within
"$node init-outLink"
    (procedure "_o4" line 5)
    (Simulator run-mcast line 5)
    invoked from within
"_o4 run-mcast"

-------------------------------------------------------
Please help me
Sincerely,
Syam Appala