Unity Type Mismatch For Prefabs

I have a couple of prefabs with some public variables but when I assign a component to one of them (by clicking at the circle on the right) it says type mismatch however, when I spawn the prefab and assign the component it works.

I tried changing the variable that didn't work by a game object and then use GetComponent to get the component but it said type mismatch again and it only accepted other prefabs.

By the way, the problem started happening when I changed the player's layer

as far I understand, I would suggest you:

• copy your prefab to hierarchy. then right click on it >> prefab >>unpack completely. Probably now you can assign a component. then create a new prefab from this edited object.

This should work. Lemme know if not works.