Oh thanks, that was the perfect recommendation.
The error checker built into Calibre didn't find the issue, but EPUB-Checker confirmed:
Code:
Fatal Error while parsing file 'The entity "nbsp" was referenced, but not declared.'.
Googling that error, this StackOverflow post points out that nbsp is not a recognized XML entity (even though it's about something completely different).
It recommends declaring the entity or using the hex:
Code:
& # xA0; or & # 160;
(But without spaces, apparently deleting those on this forum breaks the text, even in a CODE block)
There were other errors, lots of "parsing file 'element "span" not allowed here;"
Too many, and I'm not sure how to fix them. Those weren't marked "FATAL" though. I'll try find and replace on the nbsp's and hope that goes most of the way.
Repairing every error could get really time consuming... really hope this is find and replace.
(Maybe this was all because I converted from .mobi?)
Thanks!
StackOverflow link:
https://stackoverflow.com/questions/...erenc#13012488