Create MATLAB Functions from MuPAD Expressions(R2013a)

I tried Running the Example in the following link http://www.mathworks.com/help/symbolic/create-matlab-functions-from-mupad-expressions.html

I create a mupad file that contains the following:

x := r*sin(a)*cos(b):
y := r*sin(a)*sin(b):
z := r*cos(b):
S := matrix([x, y, z]):

then I create a handle to it from Matlab command line nb1=mupad('file.mn')

I then call : S = getVar(nb1,'S')

then h = matlabFunction(S)

when I should get :

 h = 
    @(a,b,r)[r.*cos(b).*sin(a);r.*sin(a).*sin(b);r.*cos(b)]

I get :

 h =
    @(S)S

can any one help?