Printing Issue message

I have created a large file with many photos and text in it (CorelDraw). Everything is 300 dpi in CMYK. When I choose to print it (tiled) I get the message you see below.

I have searched through all the photos one-by-one, plus looked at the document using wireframe for something hidden but cannot find anything. Is there a way to have Corel show me where that item is? It is very annoying to get these printing issue notices without it showing where the problem lies.