```
cvx_begin
variable e(N,1) complex
minimize ((vs+e)'*inv(Rc)*(vs+e))
subject to
vs'*e==0
(vs+e)'*inv(Rc)*(vs+e)<= vs'*inv(Rc)*vs
cvx_end
```

vs and e are N*1 complex vector，Rc is a N*N comlpex matrix.

Disciplined convex programming error:

Invalid quadratic form: product is complex.