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[ns] warning: no class variable Snoop::debug_ ????



hi,
 
when i tried to run script that attched snoop in ll (set $opt(ll) LLSnoop) and there was a message appear below.
what am i supposed to do to get rid of this message?
 
warning: no class variable Snoop::debug_
            see tcl-object.tcl in tclcl for info about this warning.
 
Note, i used ns 2.1b7a, and i've modified file snoop.cc according to modification that made by Benyuan Liu
 
regards,
dade