I'm trying to use branch-and-bound method to solve the following IP

my code is;

f=-[9; 5; 6; 4];

A=[6 3 5 2; 0 0 1 1; -1 0 1 0; 0 -1 0 1];

b=[10; 1; 0; 0];

lb=zeros(1,4);

ub=[1 1 1 1];

Aeq=[]; beq=[]; x0=[];

options=optimoptions('linprog','Algorithm','Simplex');

[x, fval, exitflag, output]=linprog(f,A,b,Aeq,beq,lb,ub,x0,options);

z=-fval

But matlab gives me this error,

Error in Untitled4 (line 10)

[x, fval, exitflag, output]=linprog(f,A,b,Aeq,beq,lb,ub,x0);

I'm not sure why, help?