photo was unable to open the library (5416)
I am a long time Apple user, well over 15 years, I received this message "photo was unable to open the library (5416)" for every photo database. I regularly use a Photo database on an external Thumderbolt 2 drive, I would not use ExT Fat to format a thunderbolt drive. But even the default internal photo database in the pictures folder is giving me this error. Is there a way to resolve this? I have an iMac Pro, 64 GB Ram, I do significant Final Cut editing.
iMac 27″, macOS 10.13