OK, now that we know what version you're running, go ahead and add these things at the top of your programs for the time being:
use strict; # Helps to prevent a few common coding
use warnings; # Turns on "lexically-scoped" warnings,
# a bit better than -w
use diagnostics; # Makes error messages more helpful
If I had known about Diagnostics from the beginning, I would have saved myself so much work... ;)
Update: Fixed improper capitalization as pointed out by the nice AM.
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