You will need minimum one thermostat object, for the hvac simulation to run. What HVAC system did you used for the simulation?

Keep in mind that a humidistat object only set up a humidity control point for the zone, some DX cooling-only system like DX dont take care of the moisture properly; depends on your model, you will need a proper system for that. eg : you can add some object like ZoneHVAC:Dehumidifier:DX with reheat coil to take care of the excess moisture.