Error in Cover Generator

I need to generate a cover that just has the spine text and back info. I have everything else designed for the front. I tested it out on Pressbooks, and it worked fine… I had spaces for the title and subtitle. Then I upgraded the book so that the watermarks would be removed, and now, the same book gives an WP error, saying the file cannot be found, and does not create a cover. What to do?

Well, I may have fixed it by putting a single letter in both places, and somehow, it worked, so maybe I’ll hope I don’t have to regenerate the cover again.

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