strange face in body

Hello

I am trying to simulate a circular array of 8 reflectors.

The reflector is done with two opposite half-sphere, or ellipsoid (it is a kind of dipole). It works for the half-sphere but not for an ellipsoid.

I have been able to simulate a single reflector of two opposite ellipsoids, but I do not understand why with the array the following error happens:

Error: strange face in body component1: name

I have drawn the ellipsoid with the variables a b (axes). If they are the same (half-sphere) it works...

I hope someone could help me.

Thank you.