Size mismatch when i am using simulink

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Greetings all, i am currently using simulink to do a project, however when i run the model the mismatch error has occured, below is the code an d details of the error:

Size mismatch (size [1 x 1] ~= size [2 x 10]). The size to the left is the size of the left-hand side of the assignment. Function 'MATLAB Function2' (#370.215.216), line 9, column 1: "u"

can anyone help me to fix this problem? many thanks!!!

function u  = fcn(x,y,K,P,u, Theta,Pstore)
for i=2:10
    h=[x(i-1);1];
    K=P*h*inv(h'*P*h+u);
    Theta(:,i)=Theta(:,i-1)+K*(y(i)-h'*Theta(:,i-1));
    P=(eye(2)-K*h')*P/u;
    Pstore(:,i-1)=[P(1,1),P(2,2)];
end
u=Theta;