ZrssFeed using invision feed but getting error

ZrssFeed using invision feed but getting error

Using ZrssFeed ( http://www.zazar.net/developers/zrssfeed/) to display the rss feed of my forum but it's returning an error
  1. <script type="text/javascript">
    $(document).ready(function () {
        $('#test').rssfeed('http://www.fmuforum.com/index.php?app=core&module=global&section=rss&type=forums&id=1', {
            limit: 5
        });
    });
    </script>





When you then load the page with the script yo uget the error

Feed could not be loaded.
It seems to be related to something to do with the format of the RSS as others work fine. Any ideas? Thanks!