Indeed. Having non-convex zones should be your priority if you intend to use FullInteriorAndExterior, FullInteriorAndExteriorWithReflections for solar distribution. You can change the solar distribution setting as recommended by @AbrahamYezioro if you don’t intend to use FullInteriorAndExterior, FullInteriorAndExteriorWithReflections. And that will cancel the severe error concerning the non-convex zone. This is how you change the setting.
Lastly, as Abraham said, it is always prudent not to expect things to work universally.
