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Error: Feed failed! Causes may be (1) No data found for RSS feed https://pinboard.opera.com/view/5a99cda5-88a6-41b8-8131-5d0066b2477e/; (2) There are no items are available for this feed; (3) The RSS feed does not validate.
Please verify that the URL https://pinboard.opera.com/view/5a99cda5-88a6-41b8-8131-5d0066b2477e/ works first in your browser and that the feed passes a validator test.