You have declared the filehandle used in "open" (my $fh) - That makes $fh a Symbolic reference to the file handle, and I don't believe you are trying to do that - more likely, this is a result of misunderstanding the statement in the doc:
If FILEHANDLE is an undefined lexical (my) variable the variable is assigned a reference to a new anonymous filehandle....

Juse use an UNDEFINED name like FH (No dollar), and you'll be OK.
Update: OK - seems like I need to re-read the docs myself. See notes below.

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In reply to Re: Parsing Multiple Lines. by NetWallah
in thread Parsing Multiple Lines. by /dev/trash

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