So i grabbed my list of pdfs to combine, and i get this.
so i went back and tried to combine groups of files, and it worked up to the 20th file, but wouldn’t combine the 21rst. So i combined the 20 files, then combined that to the 21rst which worked, but the 22nd file keeps giving me that message. What does it mean?
I receive the same error message when I attempt to combine PDF files that were generated using LibreOffice’s built-in PDF export tool. I was trying to combine PDF files generated with LibreOffice Writer version 22.214.171.124. If I generate the PDF files using the PDFCreator printer driver, the problem goes away. PDF files from other sources seem to work fine as well.
I’m afraid I don’t know which PDF engine LibreOffice uses. Files created using the PDFCreator print driver combine with no problems.
I was struggling with the same problem, but after reading these posts I solved it like this. Print the document that causes the problem to printer ‘pdf architect’ and save. I was able to combine this newly created document with other documents.