Hmm this isn't an error. It's a warning.
in reply to Re: Supressing zero values in formatted reports
in thread Supressing zero values in formatted reports
Argument "%s" isn't numeric%s
(W) The indicated string was fed as an argument to an operator that expected a numeric value instead. If you're fortunate the message will identify which operator was so unfortunate.
This means although the warning is displayed your program should run normally.
"WHAT CAN THE HARVEST HOPE FOR IF NOT THE CARE OF THE REAPER MAN"
-- Terry Pratchett, "Reaper Man"