I didn't really check all errors (since there were many), but I did try "fix all errors" within the Calibre editor (which removed invalid characters, and probably more), but no change on the ereader.
You can try an epub-to-epub conversion in Calibre. It seems to fix many things.
You could also post in the epub-forum here on Mobileread. There are many very experienced people that probably can help you out.
FWIW, I don't think the software should just quit, if the epub is out of spec, give that information, and then quit.
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