I was trying to close the desktop app and this is what happened:
Error
An error occurred. Please use Tools > Check Database to see if that fixes the problem.
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Anki 2.1.35 (84dcaa86) Python 3.8.0 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.15.7
Flags: frz=True ao=False sv=?
Add-ons, last update check: 2020-11-12 15:30:56
Caught exception:
Traceback (most recent call last):
File “aqt/main.py”, line 1016, in closeEvent
File “aqt/main.py”, line 462, in unloadProfileAndExit
File “aqt/main.py”, line 439, in unloadProfile
File “aqt/main.py”, line 548, in unloadCollection
File “aqt/main.py”, line 812, in closeAllWindows
File “aqt/init.py”, line 118, in closeAll
File “aqt/main.py”, line 546, in before_sync
File “aqt/main.py”, line 924, in maybe_auto_sync_on_open_close
File “aqt/main.py”, line 542, in after_sync
File “aqt/mediasync.py”, line 129, in show_diag_until_finished
File “aqt/main.py”, line 539, in after_media_sync
File “aqt/main.py”, line 435, in callback
File “aqt/main.py”, line 444, in _unloadProfile
File “aqt/profiles.py”, line 270, in save
File “anki/db.py”, line 47, in execute
sqlite3.OperationalError: attempt to write a readonly database