Fixed warning when enemies spawn

I still have other warnings like: 
The referenced script on this Behaviour is missing! UnityEngine.Object:Instantiate(Object, Vector3, Quaternion)
MakeMap:PlaceMap() (at Assets/Scripts/Map Generation/TileMap/MakeMap.cs:52) 
and 
The referenced script on this Behaviour is missing!
UnityEditor.DockArea:OnGUI()

But the program still runs fine