I run my Complementary Geometric Programming below but found a problem.

t11=300;

t21=400;

t31=600;

U1=120;

U2=80;

U3=40;

T0=100;

T3=500;

WC=10^5;

AT=15000;

cvx_begin gp quiet

variables A1 A2 A3 T1 T2 t12 t22 t32

minimize AT

subject to

```
(T1+(-T0)+t12)/t11<=1;
(T2+(-T1)+t22)/t21<=1;
(T3+(-T2)+t32)/t31<=1;
(T1+U1*WC^(-1)*A1*T0)*(T0+U1*WC^(-1)*A1*t12)^(-1)<=1;
(T2+U2*WC^(-1)*A2*T1)*(T1+U2*WC^(-1)*A2*t22)^(-1)<=1;
(T3+U3*WC^(-1)*A3*T2)*(T2+U3*WC^(-1)*A3*t32)^(-1)<=1;
A1>0;
A2>0;
A3>0;
AT>0;
t12>0;
t22>0;
t32>0;
T1>0;
T2>0;
AT=A1+A2+A3;
```

cvx_end

Error using + (line 83)

Disciplined convex programming error:

Illegal operation: {log-affine} + {concave}

Error in CGP (line 24)

(T2+(-T1)+t22)/t21<=1;

I have read the some critical information:

and the cvx handbook about GP.

But I can not deal with my problem…Need help!