Quote:
Originally Posted by crich70
I'm having a problem and I don't know what is causing it. I'm trying to merge several epubs and getting the following message:
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The error suggests that the 2nd book in the merge has a missing or empty idref attribute on one of the tags in its metadata.
If you can post or otherwise get me the epub(s) causing the problem, I can probably tell for sure.
However, in any case, the answer is probably going to be to fix the input epub. Convert usually works, Polishing or Modify Epub might. I haven't tried the epub validation in the new built-in editor very much, but it may correct such problems, too.