EPZone has no attribute CenPt - For walls with holes

Hi everyone,

I'm not a very experienced Grasshopper user (yet) and im all new in using Honeybee. I have been playing around with a basic example for daylight analysis seen at the following site:

http://hydrashare.github.io/hydra/viewer?owner=mostaphaRoudsari&...

I have been playing around with different geometries to test it out. However i often get the error "EPZone has no attribute CenPt" when I use walls with holes in them. However, if the wall is divided into rectangles instead I can avoid this error (as seen in the sketch below).

My question is therefore:

Why do this error occur? and can I avoid this type of error in other ways than by "cutting" my model?