Update: The error Iris was getting early on turns out to be a PHP bug, not with this script. It affects PHP version 5.2 and early versions of 5.3, you need PHP 5.3.9 or newer to be able to use it properly. But if you do happen to use older version, do not worry, look at the first page and I've offered a solution to get through this error.
https://bugs.php.net/bug.php?id=43200