I'll readily admit, I didn't, and still don't, have any idea what that message means. Yes, I know it means a page in PDF form won't be displayed but I don't know what it MEANS, in the sense, it doesn't tell me what to do to fix it.
So I experimented and found out how to fix it.
Here's what you should do:
Go through the PDF file and note every page where you get that unhelpful error message.
Then go back to your source document (the document from which you created the PDF), delete the first page that's giving trouble in the PDF and re-create it from scratch.
Rinse, repeat. Do this for every page in the PDF that gives you trouble.
Publish to PDF again after you've re-created the troublesome pages.
Your PDF should work perfectly.
Hey, I never said I'd offer an explanation. I just said I'd show you how to do things.