Hi, this is the correct screen shot of the problem I had encountered yesterday. I tried to use the back button to correct the issue and I tried to cancel, and start again but the error shows the same. So once again how do I fix this without stating over?

Ok, so do exactly what I said to do in my last post. Here it is again:
"go to Setup > Object Manager > Meeting and click the down arrow on the right to delete it and then create a new one once the old one is gone"