Question: Problem using the colorscheme option in Maple 17

I am having problems when trying to sue de colorscheme opiton. I always get an error message. The example below is from the Maple homepage:

plot3d(sin(x)*cos(y), x = 0 .. 4*Pi, y = 0 .. 4*Pi, view = [default, default, -3 .. 3], colorscheme = ["xgradient", ["Green", "Purple", "Blue"]]);
Error, (in plot3d) unexpected option: colorscheme = ["xgradient", ["Green", "Purple", "Blue"]]


Any hint?

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