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Error: Feed failed! Causes may be (1) No data found for RSS feed http://free-seo-tricks.blogspot.com/atom.xml?redirect=false&start-index=1&max-results=500; (2) There are no items are available for this feed; (3) The RSS feed does not validate.
Please verify that the URL http://free-seo-tricks.blogspot.com/atom.xml?redirect=false&start-index=1&max-results=500 works first in your browser and that the feed passes a validator test.