Unable to load because it was serialized with a newer version of Unity

Getting this error in my game, I thought I was running on the newest version, got this error so I updated it.
Now I am am the newest version and it is still occurring. Tried reimporting all my assets and that hasn’t worked.
Not having great luck through google searches.

Any ideas?

I restarted my computer, and while the error is now gone, everything in my scene is gone.