How to solve MATLAB problem "code generation"

Hello... I have a question about matlab. I got a problem during running my simulation. MATLAB give instruction "Code generation failed Inferred complexity ('on') for data 'm_dot_A_output' (#26) does not match specified complexity ('off')"

if function m_dot_A_output  = fcn(Av, PA) %#codegen
% Initialize output in case something goes wrong.
m_dot_A_output = 0;

k = 1.4; Cf=0.7; T=294.5; C1=0.0404; C2=0.1562; Pcr=0.528; Pa = 101325;

    if Pa/PA <= Pcr
        m_dot_A_output = Cf*Av*C1*(PA/sqrt(T));
    elseif Pa/PA > Pcr
        m_dot_A_output = Cf*Av*C2*(PA/sqrt(T))*(Pa/PA)^(1/k)*sqrt(complex(1-(Pa/PA)^((k-1)/k)));
    end

Hope you can solve this problem...i really need your help thank you.