Photos suddenly frozen with error message I don't understand
After considerable length of time with Apple Support person by phone in order to consolidate two Photo Libraries, the next day my Photos app was frozen with the following error message:
I dare not try any deleting! iPad, iPhone Photo adds work and all photos are there. But it appears that until I take action on this error, I cannot open Photos on my MBP.
Please advise!
MacBook Pro 15", macOS 10.14