It shows following error 'Simulink does not have enough information to determine output sizes for this block. If you think the errors below are inaccurate, try specifying types for the block inputs and/or sizes for the block outputs.'

function [Sa,Sb,Sc] = Control(Vga,Vgb,ika,ikb,Vsa,Vsb) % I_ref=0; % I_meas=0; % Vga=0; % Vgb=0; Ts= 1e-04; p= 2000; Vdc=620; R=0.8; L=0.005; g = 0; v0 = 0; v1 = 2/3*Vdc; v2 = 1/3*Vdc + 1j*sqrt(3)/3*Vdc; v3 = -1/3*Vdc + 1j*sqrt(3)/3*Vdc; v4 = -2/3*Vdc; v5 = -1/3*Vdc - 1j*sqrt(3)/3*Vdc; v6 = 1/3*Vdc - 1j*sqrt(3)/3*Vdc; v7 = 0; v = [v0 v1 v2 v3 v4 v5 v6 v7]; % Switching states states = [0 0 0;1 0 0;1 1 0;0 1 0;0 1 1;0 0 1;1 0 1;1 1 1]; persistent x_old % Initialize values if isempty(x_old), x_old = 1; end

 g_opt = 1e10;
 x_opt=inf;

 % Read current measurements at sampling instant k

 for i = 1:7
 % i-th voltage vector for current prediction

 V1= real(v(i));
 V2=Imag(v(i));
  Iast1=(2*(Vsa)*p)/(3*((Vsa)^2+(Vsb)^2));
    Ibst1=(2*(Vsa)*p)/(3*((Vsa)^2+(Vsb)^2));
    % Current prediction at instant k+1
 ik1a = ( 0.9841)*ika + (1/R)*(1- 0.9841)*(V1 - Vga);
 ik1b = ( 0.9841)*ikb + (1/R)*(1- 0.9841)*(V2 - Vgb);
  % Cost function
 g = (abs(Iast1 -( ik1a)))^2 + (abs(Ibst1 -( ik1b)))^2;
 if (g<g_opt)
 g_opt = g;
 x_opt = i;
 end
 end
  x_old = x_opt;
 Sa = states(x_opt,1);
 Sb = states(x_opt,2);
 Sc = states(x_opt,3);

end