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Error: Feed failed! Causes may be (1) No data found for RSS feed http://cse.google.com/url?q=https://www.coplanet.it/forum/group.php?discussionid=211; (2) There are no items are available for this feed; (3) The RSS feed does not validate.
Please verify that the URL http://cse.google.com/url?q=https://www.coplanet.it/forum/group.php?discussionid=211 works first in your browser and that the feed passes a validator test.