fmincon error occurs without details in Matlab

I followed the instructions, but what I only can get is "error in (filename)" without any additional details. Could you tell me which part made an error?

clear;clc;lb = [0,0]; 
ub = [1,1]; 
A = [1 1]; 
B = [1]; 
Aeq = []; 
Beq = []; 
x0=[0.5, 0.5]; 
f=@(x)(200*x(1)-37)^2+(200*x(2)-83)^2+(200*x(1)+200*x(2)-122)^2+(400*x(1)-82)^2+(400*x(2)-157)^2+(400*x(1)+400*x(2)-250)^2; 
x = fmincon(f,x0,A,B,Aeq,Beq,lb,ub)

Answer 1

[Sulaymon Eshkabilov]

It is working ok.

clearvars;clc;
lb = [0, 0]; 
ub = [1, 1]; 
A = [1 1]; 
B = 1; 
Aeq = []; 
Beq = []; 
x0=[0.5, 0.5]; 
f=@(x)(200*x(1)-37)^2+(200*x(2)-83)^2+(200*x(1)+200*x(2)-122)^2+(400*x(1)-82)^2+(400*x(2)-157)^2+(400*x(1)+400*x(2)-250)^2; 
x = fmincon(f,x0,A,B,Aeq,Beq,lb,ub)

Local minimum possible. Constraints satisfied.

fmincon stopped because the size of the current step is less than
the value of the step size tolerance and constraints are 
satisfied to within the value of the constraint tolerance.

x = 1×2

0.2090 0.4050

Answer 2

[Matt J]

lsqlin would be better for this than fmincon.

lb = [0,0]; 
ub = [1,1]; 
A = [1 1]; 
b = [1]; 

C=[200,0;
    0 200;
    200 200;
    400 0;
    0 400;
    400 400];
d=[ 37 83 122 82 157 250].';

lsqlin(C,d, A,b,[],[],lb,ub)

Minimum found that satisfies the constraints.

Optimization completed because the objective function is non-decreasing in 
feasible directions, to within the value of the optimality tolerance,
and constraints are satisfied to within the value of the constraint tolerance.

ans = 2×1

0.2090 0.4050