Here is my problem formulation, which is convex.

```
Objection function: minimize(W1, W2, q) norm(W1-W2,2)
subject to: sqrt(norm(Wi)^2+h^2)+1/q<=constant i=1,2
norm(Wi-Qi,2)<=constant i=1,2
```

where, W1 and W2 are two-dimension vector, h is a constant, Qi is a know

constant vector.

And the result I get is :Disciplined convex programming error:

Illegal operation: sqrt( {convex} ).

I hope to get the help of you.Thanks.