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Guessing that the problem is with splits in the epub file. In the Calibre epub conversion menu, select epub output from the left menu and make sure "split files larger than" has an entry of 260kb. This fixed a(n identical) problem to yours that I had.
If this isn't the problem, I've sometimes fixed a (similar) issue by converting to another format (like kepub, mobi, etc.) then re-converting back to epub.
If none of that works, it might be the particular file. Epub can be finicky handling graphics (which is what your entire ebook is.) A work-around would be to use an OCR app to convert the file to text.
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