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 None. This is not a valid choice, so either choose that it comes from the HVAC system, from an Exhaust Fan, or it is Naturally Ventilated. Note that the Natural Ventilation choice is only valid for Residential spaces and cannot be used for Commercial spaces.
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