Solution
Basically, the error says what it means, your sky shader is asking the engine to render much more in the way of cloud domes than it allows for. Usually caused by either sky shaders with two or more cloud stages and a really massive area visible in game, or sky shaders with three or more stages.
In general, be wary of using more than two cloud stages in your sky shaders. Using sky portals may now be a good alternative if you feel a standard sky isn't interesting enough. [Shallow[BAP]]
