Well, I tried using the tool, but the error fixes were above my pay grade.
I deleted the ePub and reconverted and wound up getting the same error. What I failed to mention is after converting but before loading the book, I edited it with Sigil and I think the version of Sigil I have is causing trouble. It's version 0.9.14-7.fc33 from the official Gnome Software repo Fedora uses. But I noticed when using Sigil, it will freeze and stop responding.
I wound up using my Windows PC which got everything squared away.
In the future, I will just use Calibre's built-in ebook editor instead of Sigil and see if that helps.
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