PDF Exporting Issue

Hi Adobe Community,

I keep experiencing problems whenever I export my PDF from Illustrator.

The message keeps saying:

"An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem."

Does anyone know why this keeps happening? Sometimes I will make a new file and save it and it works.. But it's taking so much time to export one file when I have multiple files to export.

Please help!

Best,

Peter