The fix for this issue is available in the latest update of InDesign version 15.0.3
Please update your InDesign application to this version to get the fix.
Adobe InDesign team
An error occurred while saving the commentWarittha Dumkaew commented
I had the same problem with another file in April 2020 can't find any solution and again now September 2020 I still have the same problem.
So I track down to export page by page and found that some of the page error, can't export. and the page that has a problem doesn't show a sample on the thumbnail also.
but if I export with PDF/x-1a: 2001 and PDF 1.3 suddenly work but some text missing form the pages that damage.
Such an annoying program, why do I still pay for it