Terrain splat 0 is null. What is this and how to fix???

I get the fallowing errors with out project:

Terrain splat 0 is null. Terrain splat 2 is null. Terrain splat 3 is null.

Sometimes the console has nothing else to provide and sometimes it will point to our terrain files. As far as we can tell, there is nothing missing with our terrain objects and that everything is connected and added.

Other times we get the fallowing in the console for the errors:

UnityEditorInternal.InternalEditorUtility:GetGameObjectInstanceIDFromComponent(Int32) UnityEditor.DockArea:OnGUI()

As far as I can tell, there is no issues with our terrain and how it looks in game.

Some of our theories as to what might be going on are as fallows: 1) Multiple Terrains in the project will cause this. 2) It might be a shader issue.

We have had this issue with Unity 2.6 and with Unity 3.0

Anyone have any ideas as to what is going on? Or any ideas on what to look for or check?

The errors about terrain splats are because you have a terrain with empty texture refernces. Select your terrain, and make sure all the entries defined in the "Paint" tab are assigned to valid textures.

In addition, the number of the missing splat is the same order as the textures shown in the paint tab, zero relative.

Terrain splat 0 is null.
UnityEditor.DockArea:OnGUI()

I am getting this area does anyoone know what the problem is?
i got rid of all textures on the terrain editor but what does “UnityEditor.DockArea:OnGUI()” mean and how do I fix this problem
any help would be great

thanks,
Zach

Note: if you are using Windows 10 the problem is the operating system. I do not know how, but something happened between 9978 and 9926 because the 9978 javacript refused to functioning.