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Your clue are these lines
Failed to mark chapter
Traceback (most recent call last):
File "site-packages\calibre\ebooks\oeb\transforms\structure.p y", line 93, in detect_chapters
File "lxml.etree.pyx", line 673, in lxml.etree._Element.addprevious (src/lxml/lxml.etree.c:31716)
TypeError: Only processing instructions and comments can be siblings of the root element
they indicate that your file has very poor markup, look for something like content outside the <html> tags
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