Lightroom classic book export issue

[Kadofoto]

Hi,
following the creation of a book from my photos, I cannot save nor to PDF nor to upload to Blurb: during export Lightroom stops and shows a message : "An error occurred while saving the book. an error occurred adding text and fonts to the book."
I use only a single line page text for each page, with default Myriad Pro text type.

Tried to select all text fields and change text type back and forth to anything but it does not help. 

Thank you for your feedback and support.

{Moved from Lightroom Cloud to Lightroom Classic Forum by Moderator}

[Rob_Cullen]

Always difficult to diagnose, changing text- a good try!

You may find some more suggestions in this thread- including a suggested way to 'find' a text fault-

https://community.adobe.com/t5/lightroom-classic/book-module-uploading-to-blurb-an-error-occurred-wh...