That's a partial conversion error of some kind, so the files and filenames mentioned are probably not going to come from the original epub that was submitted. As such, they're not very useful in diagnosing the problem either.
The best thing you can do is make sure your epub validates without errors or warnings (using either the epubcheck plugin for Sigil, or the online epubcheck validator) before submitting to D2D.
If you're not actually submitting an epub, then the Sigil forum is not really the place for this question.
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