Error: Feed failed! Causes may be (1) No data found for RSS feed http://www.ub.uni-heidelberg.de/cgi-bin/edok?dok=https://whatweather.today/; (2) There are no items are available for this feed; (3) The RSS feed does not validate.

Please verify that the URL http://www.ub.uni-heidelberg.de/cgi-bin/edok?dok=https://whatweather.today/ works first in your browser and that the feed passes a validator test.