Quote:
Originally Posted by kovidgoyal
Just click save, quit and re-open your book, you will be fine. Or use save a copy if you want to be doubly safe. And if you can figure out what you did to cause that error, it would help me fix it.
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*facepalm*
Opening the file again today did indeed fix the problem, I'm a bit amazed it could be that easy, but at the same time embarrassed I didn't try that on my own.
Thank you!
As for how I caused it I can't say exactly. The first time it occurred I was renaming the last .html file, after having successfully renamed the previous 22 files. I tried a few more times and then moved on, performing several more edits to the .html files throughout the book (I did have all those files open in tabs, if that could have been part of the problem...) and saving frequently, which is why when I realized I was getting the same error when I attempted any directory-level changes (renaming other files, adding new images), I couldn't just try reverting to before I got the error.
I'm not sure if that helps you or not! Thank you, though, for taking the time to reply, @kovidgoyal!