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The message does not say the ePub is not valid, just that B&N might reject it, and we don't know the requirements they have, but guessing:
They want a <dc:date> element. It is not compulsory by the spec, but it makes sense they want a date.
They want a opf:file-as attribute in the <dc:creator>, or they want the author names formatted as "Last-name, First-name", or something similar.
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