Than why would it work if I took the "use strict" pragma out? BTW, it's a typal, it should be "CRITICAL".
I took a look at utils.pm, it's a hash, not a method. To clarify, you saying I should use single qoute:
exit $ERRORS{'CRITICAL'};
instead of double qoute:
exit $ERRORS{"CRITICAL"};
because it intrepret the double qoute as: $CRITICAL->ERRORS();
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