I tried the hex route too - no go.
After systematicly gutting the book chapter-by-chapter (which felt good) I was left with no content and still the error.
It turns out my copyright metadata I had set in InDesign during the original export had special characters. Once that was gone it was fine. Errg.
Now the table of contents menu item on the left is not active even though there is a TOC file and it is useable in the document. I even compared to a working ePub and all my manifest, spine, guide look right. More searching.
- DF
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