There's no manifest and no spine. So there's nothing in the book except some metadata! ADE has a fallback mode (which they really should remove) where it will simply look for a 'toc.ncx' file without reference to the opf, which is why you might see it there. But clearly there are deeper problems here because as far as the opf is concerned your entire book has been wiped out. Maybe just try generating it again in calibre.
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