Error in 'new/S-Function' while executing MATLAB S-function 'model', flag = 0 (initialize), at start of simulation.

function [sys, x0] = model(t, x, u, flag)

F0 = 40;

T0 = 410;

CA0 = 0.5;

V = 48;

Vj = 3.85;

Fj = 49.9;

alpha = 7.08e10;

E = 30000;

R = 1.99;

U = 150;

A = 250;

Tj0 = 530;

lambda = -30000;

Cp = 0.75;

Cj = 1.0;

rho = 50;

rhoj = 62.3;

beta = U*A/(rhoj*Cj*Fj);

if flag == 0

x0(1) = CA0;

x0(2) = T0;

x0(3) = Tj0;

sys = [3 0 3 0 0 0];

elseif abs(flag) == 1

Ca = x(1);

T = x(2);

Tj = x(3);

k = alpha*exp(-E/(R*T));

sys = [F0*(CA0-Ca)/V - k*Ca; F0*(T0-T)/V - (lambda*k*Ca)/(rho*Cp) - (U*A*(T-Tj))/(rho*Cp*V); (Fj*(Tj0-Tj)/Vj)+(beta*Fj/Vj)*(T-Tj)];

elseif flag == 3

Ca = x(1);

T = x(2);

Tj = x(3);

sys = [Ca; T; Tj];

else

sys = [];

end

xguess=[0.4982;489.3;492.4158];

xs=trim('new',xguess);

end

I want to get the steady state near the xguess how should I do it?