Is Apple ever going to fix this absurd problem? I was hoping that this issue would be fixed with Sierra and a Photos update. I've sent a lot of feedback to Apple about it. But evidently, usability is no longer a priority. For those unfamiliar with it: try to access your Photos library from Mail or Final Cut. The icon is there, but when you click it, you get the message that's the title of this thread. To make matters even worse, there's no longer an easy way to find your photos within the app's package. Previously, your photos were logically sorted in the Masters folder, and then into folders by date. Now the folders have indecipherable names and seemingly no rational organization. I think Apple really wants everyone to go back to using iPhoto. EDIT: I was wrong about the Master's folder; it's still there. But there's another one within the Resources folder as well; that's the one I had been looking into.