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Problem with functional derivative

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SS
SS 2018-5-28
Dear,
I am trying evaluate variational derivative of the form:
delta(F)/delta(e1)
F is the functional and e1, e2 and e3 are strain measures.
I used the following code, but get a zero result. Could you please help if I am going wrong.
syms e1(x,y) e2(x,y) e3(x,y) a1=1; a2=1; f = a1*diff(e1,x,x)+diff(e1,y,y)+a2*(diff(e2,x,x)+diff(e2,y,y)+diff(e3,x,x)+diff(e3,y,y)); D = functionalDerivative(f,e1)
Thank you, SS

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