When I try to open the drawing files using autocad 2018, I get this message: Unused Non-Parent Objects: OutdoorAir:Node The following are not supported: objects related to controls, AirTerminal:SingleDuct:Uncontrolled, or ZoneHVAC:IdealLoadsAirSystem Then Autocad opens a file but it's completely blank. How can I see the drawing file? I already added information for the Output Surface: Drawing object DXF Regular Polyline, and selected autocad as the drawing viewer in EP-Launch.