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A Perl program called Checklinks.pl from Perl for Dummies

checklinks.pl doesn't work on my web site. It said that the link to SSRN-id1938397.pdf is a bad link yet when I click on "The Invisible Man" which is its label I get to the document.  Is it possible the Perl Script which runs on my laptop fails because it can't load the acrobat reader. I'm only a novice at Perl so any ideas out there.