Error: Feed failed! Causes may be (1) No data found for RSS feed http://bukkit.org/proxy.php?link=https://vimeo.com/704978969; (2) There are no items are available for this feed; (3) The RSS feed does not validate.

Please verify that the URL http://bukkit.org/proxy.php?link=https://vimeo.com/704978969 works first in your browser and that the feed passes a validator test.