S-function level 1, not enough inputs arguments??

Hi!

I'm trying to do a S-function with a matlab script, but I can't. Matlab gives me an error when I try to run it. The error is the following:

"Error in 'prueba1/S-Function1' while executing MATLAB S-function 'mrflap', flag = 3 (output), at time 0.0. Caused by: Not enough input arguments."

I've checked the part of flag 3 and I have not been able to find the error.

function sys=mdlOutputs(t,x,u,m,gamma,rho,a,e,c,I_b,R,g,Omega,M_b)

%Inputs

p =u(1); q =u(2); A_1 =u(3); B_1 =u(4); bV_x =u(5); bV_y =u(6); bV_z =u(7); v_1 =u(8); theta_0 =u(9);

%Main Rotor Flapping Equations

beta_1s=...;

beta_1c=... ;

%Outputs

sys(1)=beta_1s; sys(2)=beta_1c;

I have to say that first I run a file with all the constants that I need.

Can someone help me please?

I would be very grateful.

Thanks