Hai all,
          I use multicasting for my project work. When I ran my tcl scripts, I 
got an error as
             
   
  ns: _o16 new-group 0 -2147483648 -1 cache-miss: can't read "protocols_(-1)": 
no such variable
      while executing
  "$protocols_($iface) upcall $code $source $group $iface"
      (procedure "_o17" line 9)
      (mrtObject upcall line 9)
      invoked from within
  "$mrtObject_ upcall $code $src $group $iface"
      (procedure "_o11" line 3)
      (Node new-group line 3)
      invoked from within
  "$node_ new-group $src $group $iface $code"
      (procedure "_o16" line 3)
      (Classifier/Multicast new-group line 3)
      invoked from within
  "_o16 new-group 0 -2147483648 -1 cache-miss"
   
   
  I can't understand the error.Can anyone help me?
   
  Thanks.

                                
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