Revert causes ArgumentException.

[Carlos Mangas]

A revert from a GameObject of the project causes an ArgumentException: The Object you want to instantiate is null.

I searched for the reason and some prefabs containing UPrefab are marked on Unity as not being real prefabs. Dunno why this is happening.

I fixed one and when I saved, closed and re-opened Unity I got the same error, I didn't check if the GameObject causing the error was the same as last time, is very time consuming sorry.

[Devon Klompmaker]

Waiting on some more information: Repro's and / or screenshots of the suspect prefab assets and instances.