Shadowplot Command of a sphere

Ive been trying to create a shadow behind a sphere in a GUI. However, it keeps giving me an error when I put in shadowplot x. I do not know if there is a better way to do this for a sphere.

This is the error i keep getting. "Surface must have at least 2 monotonically increasing dimensions"

If anyone knows the best way to use the shadowplot command specifically for a sphere i would greately appreciate it.