I'm making a book iPhoto. There's a red flag on the cover I can't get rid of. I have changed the color, arrangement of photos, the type, etc. and the red flag stays. Help! CB

I'm making a book in iPhoto. Everything is done and I'm ready to send it in, but cannot get the red flag on the cover page to go away. I have tried changing the page options, print options, number of photos, size of fonts, etc, etc. The flag remains. This has happened before, but making the font smaller or using fewer words has removed the red flag; can't make it happen this time. Help!