I have a document that was working fine on version 9 but is failing on version 12 with the error message "internal error: no area". Since it is a large document it is difficult to track down what is causing the error since that is all I have to go on.
Internal Error: No Area
Would you be able to email me (firstname.lastname@example.org) the document?
That fixed it for me. Thank you for such a fast response.
The fix for this issue has also been included in Prince 12.5.