invalid command name "tk::MenuDup"

Hi to all,

I'm developping an user interface in TCL/TK but in some computers this error
occurs :
<Tcl> invalid command name "tk::MenuDup"

when the user runs :
tm <- tktoplevel(height=500,width=800)
topMenu <- tkmenu(tm)
tkconfigure(tm,menu=topMenu)

i don't understand why this code works on my computer and is not running on
other user environment ?

thanks,


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