When modeling conditioned spaces under Title 24, all spaces are required to be ventilated per the code. At the Zone level of the tree, in the Mechanical tab, you have set the Ventilation to HVAC, but the HVAC system is ductless. A ductless system cannot be the source of ventilation. Either change the ventilation source to Exhaust Fan, None or Natural Ventilation or modify the HVAC system to include ducts. Note that the Natural Ventilation choice is only valid for Residential spaces and cannot be used for Commercial spaces.
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