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My guess is there is an issue with the EPUB itself. Open the book in Sigil (make sure you see the text) and save it. This will cause a bit of cleaning to take place. Try it on your Nook and if it still doesn't work open it again in Sigil and run flight crew (built in EPUB validator). You will need to fix the issues as there is something the Nook doesn't like a the file. If there is no text in Sigil then something is seriously wrong with the EPUB.
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