Can anyone please debug the error

My function is as follows

function F = myobjfun(x,y) syms i x y k F = symsum(((y(3).*x(i).*log(1+x(i))/symsum(x(k),k,0,9)-(y(2).*x(i))),i,0,9); end

when i am passing x=[1,2,....10], y=[0.5,0.5]

I am getting the following error

Error using mupadmex Error in MuPAD command: Index exceeds matrix dimensions.

Error in sym/subsref (line 1580) B = mupadmex('symobj::subsref',A.s,inds{:});

Error in myobjfun (line 4) F = symsum(((y(3).*x(i).*log(1+x(i)))-(y(2).*x(i))),i,0,9);