I'm learning to use openstudio. I've learned to use it without HVAC systems, but now I'm trying to simulate one. I've just done what tutorial describes, I create a one space-thermal zone in SketchUp and added a new Packaged Rooftop Unit where I added the thermal zone I've created. Nevertheless, the simulation launch a fatal error:

Last severe error=IP: IDF line~3078 Object=CONTROLLER:MECHANICALVENTILATION, name=CONTROLLER MECHANICAL VENTILATION 1, Required Field=[Zone 1 Name] was blank.

I don't know what else I've got to do, I'll appreciate your help.