Just wondering why you have the following at the top of your code (i.e. two shebang lines):

#!/usr/bin/perl

use 5.006;

#! /usr/bin/perl
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... or whether that's just a typo from you entering it on the forum. If those lines are both in your code, then there's a reasonable chance that may be the cause of your problem. (or, at a minimum, it would be a good thing to take care of ... i.e. delete the second one)