Question: no coordinate names were given when trying divergence in vectorcalculus

http://www.maplesoft.com/support/help/Maple/view.aspx?path=VectorCalculus/Divergence 

 

with(VectorCalculus):

SetCoordinate(cartesian[x, y, z]);

F := VectorField(<x^2,y^2,z^2>);

Divergence(F);


Error, (in VectorCalculus:-VectorField) no coordinate names were given

Error, (in Vector) dimension parameter is required for this form of initializer

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