Hi there!
Some plugins that messes with save files, when you update or add them, and try to load a previous save file where they are not there, it will trigger an error. Usually, when you start a new game, it works fine, and that is the solution on this cases. That is a known issue/behavior of the rpg maker itself. Is something like that is happened to you?
If not, what plugin did you update? If you press F12 or F8, a bnrowser window will open. Go to the CONSOLE tab, and show me a screenshot of what is in there.
I've tried to create a new save file but the same thing happened and I only updated eli book cause i got the update notification.