Mimeo Photos will display the following error message when it can't locate some of the photos in your project.

This error will be displayed when a photo is no longer available in the corresponding Apple Photo Library. 

If you inadvertently deleted the photo, you can check the "Recently Deleted" folder and recover it. In addition, you can also review Apple's article on 'Getting Help with Missing Photos'.

If you didn't delete the photo, those photos may have existed on removable media such as a hard disk or flash card. Or possibly on your local hard drive, but not in Photos. 

Did this answer your question?