suddenly the plugin comes up with an error message:
“RSS Error: A feed could not be found at http://www.rockantenne.de/rockantenne.html. A feed with an invalid mime type may fall victim to this error, or SimplePie was unable to auto-discover it.. Use force_feed() if you are certain this URL is a real feed.”
The URL is the official RSS Feed of this Webpage. Any idea what to do?