Исправить вывод rss ленты на DLE

Существует проблема с отображением рсс-ленты на cms dle.

Сторонние сервисы пишут об ошибках, напр. при попытке добавить в feedburner:

The URL does not appear to reference a valid XML file. We encountered the following problem: Your server is sending us some non-XML data. This is usually caused by your blogging platform or server generating an error page that is not in a valid feed format (usually it is plain-text, or HTML). Please confirm that your source feed is working properly.