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[ns] question on tracefile



 
 
Hello,
 
I run the tcl/ex/tg.tcl on linux to have a test on the use of Tracefile. However, it gives out the following message:
warning: no class variable Tracefile::debug_
    see tcl-object.tcl in tclcl for info about this warning.
 
Well, what's the problem? How can I fix it?
 
Thanks.
 
Xiaoyu