This script will check the files you named to see that they all exist, are readable by the script, and are not empty.
Hopefully, running it will help you pinpoint the problem.

#!/usr/bin/perl -w

use strict;

my @files = ("/mnt/csphil/home/fburns/domereports/Weekly_Reports/de-nj
+-md", "/mnt/csphil/home/fburns/domereports/Weekly_Reports/pa_only", "
+/mnt/csphil/home/fburns/domereports/Weekly_Reports/phila_market");

my $file;
foreach $file (@files) {
    if (! -e $file) {
        warn "$file does not exist";
        next;
    }
    warn "$file is unreadable" unless -r $file;
    warn "$file has zero size" if -z $file;
}
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