Numbers Unexpectedly Quits and won't reopen
My 2014 iMac Retina 5K is updated as far as it can go (Big Sur 11.7.9) and I have had no problem with Numbers (V. 12.1, the version the App Store will allow me to download) until recently, when it "unexpectedly quit" and will not open any longer.
I have restarted in Safe Mode, holding down the shift key, and the problem remains. I have deleted the Numbers app and reinstalled it and that didn't work. I tried to find a preference file for it to delete in the library, but only saw some old iWork files, but deleted those. I read here that you could try signing out of iCloud, but I can't seem to find how to do that in System Preferences, as I don't see any place to sign out, just many places that I'm asked to sign in again.
I've looked at previous discussions here on the matter, and no one answer seems to resolve this strange problem that just occurred. If it will help, I can show the crash report that comes up after each unexpected quit:
Earlier Mac models