I got this same error message and tried a variety of solutions, (Opening the metadata and analyzing it, changing chapter names in my ePub file (They started with a number) removed spaces and hyphens from file names, resaved files from scratch, etc.) none of which worked. Given the error message references "assets/asset[2]/data_file/file_name", I figured it must have something to do with the second asset in the asset screen of iTunes Producer, which is the art for the ibook cover. I opened my cover art file and found its size was 420 x 599, when it should've been 400 x 600. I resized it, made sure it was saved as a .jpg, resubmitted it and...problem solved.
It was like I knew what I was doing.
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