[ns] what might be the error???

[<mahesh@cs.iitm.ernet.in>]

hi seniors,
i'm trying to run a multicast simulation in which i got the following
error:
/********************************************************/
warning: Flag variable Simulator::EnableMcast_ discontinued.
         Use multicast methods as:
                 % set ns [new Simulator -multicast on]
                 % $ns multicast
warning: Flag variable Simulator::NumberInterfaces_ discontinued.
         Setting this variable will not affect simulations.
using backward compatible Agent/CBR; use Application/Traffic/CBR instead
Warning dst_ is no longer being supported in NS. dst_ 0x8001
Use dst_addr_ and dst_port_ instead

no value given for parameter "type" to "_o3"
    (Simulator duplex-link line 1)
    invoked from within
"$ns duplex-link $n([expr $i+$j]) $n([expr $i+$j+$side]) 1Mb $defdel "
    ("while" body line 5)
    invoked from within
"while {$i < $side} {
    set j 0
    while {$j < [expr $side*$side]} {
      if {$j < [expr $side*$side-$side]} {
          $ns duplex-link $n([expr..."
    (file "test1.tcl" line 37)
/************************************************************/

please help me.............

thanks in advance,
mahesh.