document.write('
Error: Feed failed! Causes may be (1) No data found for RSS feed //https://www.diigo.com/profile/datenretter; (2) There are no items are available for this feed; (3) The RSS feed does not validate.
Please verify that the URL //https://www.diigo.com/profile/datenretter works first in your browser and that the feed passes a validator test.