If you are experiencing problem with photos located in a library, then Photos app can try to repair it. You can also restore your library from a Time Machine backup. If you want to repair your library, then you should backup your photo library.
To repair your library, close "Photos" app by choosing "Photos" and then selecting "Quit Photos" option. Press Option-Command and double-click the "Photos" icon located in the "Applications" folder or you can click the "Photos" icon located in the Dock. A "Repair library" window opens up. Click "Repair" to rebuild your photo library. This is how you can repair your library.
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