write function for using optimization app

i try to use function for optimization app and i keep getting same error

 Error: Expression or statement is incorrect--possibly unbalanced (, {, or [.

this is my code

function [f,w1,w2,beta0,beta1,gamma0,gamma1,a,b,x,y]=myfun(p)
%every equation must name in function
w1 = normrnd(0,1,[1 100]);
w2 = normrnd(0,1,[1 100]);
beta0 = 0.5;
beta1 = 1;
gamma0= 0.5;
gamma1= 1;
a = exp(beta0 +beta1.*w1);
b = exp(gamma0+ gamma1.*w2);
x = exprnd(a);
y = exprnd(b);
f= exp(p(1)+p(2).*w1-p(3)-p(4).w2 )./ (1+exp(p(1)+p(2).*w1-p(3)-p(4).w2));
end

[Walter Roberson]

That code looks okay. Perhaps the problem is in the code you use to call it.