[Q] tcl/ex/newmcast/pim-loss.tcl

[Lee Jiwoong]

When executing tcl/ex/newmcast/pim-loss.tcl, I obtained next error 
message and ns stopped.

=========================
porce.kaist.ac.kr porce:/home/porce/NS/ns2.1b5/tcl/ex/newmcast> ns pim-loss.tcl
_o4: unable to dispatch method multi-link-of-interfaces
    while executing
"$ns multi-link-of-interfaces $nodes 1.50Mb 10ms DropTail"
    (file "pim-loss.tcl" line 38)
=========================

What shall I do ? Would you please point out the specific reference
pages of NS docs ? 

PS Sorry - I couldn't search archive relating this problem. The search
engine is currently not working.. :<