use strict;
use Data::Dumper;
use XML::Simple;

my $xml = new XML::Simple (KeyAttr=>[]);

my $xmlresource = "http://prlmnks.org/rss/458722.xml";

my $feed = $xml->XMLin($xmlresource); #line 20

print "Content-type: text/html\n\n";
print Dumper($feed);

ERROR:
File does not exist: http://prlmnks.org/rss/458722.xml at /usr/www/users/highgate/admin/cgi-bin/xmltest.pl line 20