Quote:
Originally Posted by kovidgoyal
@Krazykiwi: Never mind, I think I know what the problem is. It occurs if you try to merge two books that both have the same tag. Fix will be in the next build.
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I had the same problem, I just couldn't reproduce it with any arbitrary pair of books. I was able to merge most books [that I tried], but a few produced similar error message. I was waiting with a bug report until I can reproduce steps to cause the bug.