Missing files - 'iPhoto could not find source file'
Hi,
I have been exporting all my photos from iPhoto (version 9.6.1 (910.42)) to an external hard drive and have successfully exported most of them. I am left with quite a few photos in iPhoto that upon attempting to export I get an error message saying it is unable to find the source file. I have backups of my iPhoto library but unfortunately these have the same situation. I definitely didn't delete the photos. The thumbnails still show as normal but when I click to view them I get the grey exclamation mark instead of the image. Is there anything that can be done in this situation?
MacBook Pro with Retina display, OS X Yosemite (10.10.5)