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The file has a few errors. I suggest you use Sigil to fix it and validate it.
First, image files are missing from the ePub (I see they are only referenced in the CSS, probably in unused styles, though). Second, the title.html has two DTD lines, and they are incorrect. The .html files must be XHTML (which means they must have closing tags, have all tags in lowercase, etc.). Then the problem with footnotes.html is that you have & instead of &
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