You declared (or whatever use utils did) a hash called %ERRORS.

Yet later in the code, though you would like to get value of key CRITICAL of that hash, you used name ERRORS in this way and didn't know about it:

{"CRITICAL"} is resolved as a block that returns value of its last expression, i.e. string "CRITICAL"; this value is considered to be a class name, and ERRORS as a method from this class; so, you're calling method ERRORS of class CIRITCAL, what would be rewritten like CRITICAL->ERRORS();.

Hope this haven't confused you too much :-)

Perl on.

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