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Aharon - I believe the problem your seeing is caused by not having the NEWS module loaded (which it isn't by default in XOOPS 2.2.x). Backend.php attempts to load news articles to fill out the XML data. Backend.php tries to load the system_rss.html template but since it doesn't exist, the XML creation fails.
You can either modify backend.php to use something else to populate your XML data (say your calendar events, AMS, etc) or even easier is to just don't use backend.php to create your XML feed - use something like RSSfit from http://www.brandycoke.com instead.
You can either modify backend.php to use something else to populate your XML data (say your calendar events, AMS, etc) or even easier is to just don't use backend.php to create your XML feed - use something like RSSfit from http://www.brandycoke.com instead.