Looks like an issue with your selected front page in reading settings. Try selecting a different page. Or use the latest posts option instead.
If that resolves the menu screen error, you can try re-selecting your preferred front page again. It should work properly this time if what I think is wrong is correct (bad ID in the DB. Selecting anew will use the right ID).
Thread Starter
amiei
(@amiei)
Thank you @bcworkz – that’s brilliant, it worked!!! Thank you so much 🙂