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The error message is saying your opf manifest is incorrect in some way in that there exists a manifest id pointing to a non-existent file. Does this epub by chance use external audio or video resources?
Please paste a copy of the content.opf here (a screen shot would work) or pm KevinH here on mobileread with a link to the epub in its current state and I will try to track down what is happening and why. Do not post the epub link here unless the book is in the public domain.
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