Dragonfly : Creating a GeoJSON from the Dragonfly Model

[@GourabRoyPayel]

Hi there, I am trying to learn modeling with URBANopt. I started only with a single building. But at this stage when I try to do DF Model To geoJSON, I am getting an error saying "1. Solution exception:index out of range: 0". Can you please help me here. I cannot figure out what is wrong with my model.