Maybe put die statements, like below, in different parts of your code to at least see what IS working before perl fails. Then you can narrow down the problem code.

  die "I'm here in $self sub() at line ##.\n";
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Sometimes, when you run code from the command line, rather from some other way of launching it, your @INC paths and environment variables might not be the same. Put this at the very top of your script and run in both scenarios:

use strict;
use warnings;
$|=1; # Buffering
BEGIN {
    print "#### Environment Variables ####\n";
    foreach (keys(%ENV)) {
        print "$_ = $ENV{$_}\n";
    }
    print "#### \@INC ####\n";
        foreach(@INC) {
        print "$_\n";
    }
    die "#### \%ENV & \@INC: ####\n";
}
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