Package Book for Print is warning it can't open a file

[Paolo T]

Hi,

I'm working on a project originally made in CS6, but not entirely resaved in CC25.5.

When choosing the "Package Book for Print" command, I get a warning that it can't open a file in the book.

The files seems fine. Preflight can't find errors.

If I choose the "Package Book for Print" command while that file is left open, the procedure works flawlessly.

What can be the first thing I should check to catch up this issue?

Paolo

Mac mini M4 Pro, Sequoia 15.6.1, latest version of ID.

[Paolo T]

Uhm, maybe I found it. When zooming out on the pages, I could see that the montage table for two of the pages in that file was wider than the others. I don't know why, but by applying the master pages again the montage table got the right size.

Paolo