Photos App Won't Open
I am receiving this message - Photos cannot find the System Photo Library named “Photos Library.photoslibrary. How do I correct the problem or re-install Photos?
iMac 27″, macOS 10.13
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Oops. You could do a search on your HD for .photoslibrary as this is the suffix the library has.
Do you can iCloud Photos enabled? If so you can create an empty library and then make this the system library and it will download all of your photos from iCloud.
Otherwise, do you have any backups, Time Machine?