GBXML Export not working with Bentley Architecture

I have a consultant that has requested a gbXML file and can not get the export gbXML to work. For a simple example I put down four exterior walls, selected Export and I get to the gbXML, but the 'Export" button is greyed and does not allow me to chose it. I says it created the Energy Analysis Model, reports the time and then states "Named Group: Spaces not defined". What am I doing incorrect? Brian Thomas SelserSchaefer Architects