The tree "Tree" couldn't be instanced because the prefab contains no valid mesh renderer.

I have created a prefab and for some reason I'm getting the following error, it's a tree I made and I'm trying to use it with the terrain tree. The tree Tree couldn't be instanced because the prefab contains no valid mesh renderer. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) ![alt text][1] [1]: /storage/temp/112761-screenshot-1.png