At the Zone level of the Building Tree you have set the Occupancy Type to either a Single Family or Multi-Family selection. Since you are doing a Nonresidential calculation (Nonresidential Title 24 Performance), no occupancy can be set to Single Family or Multi-Family.
Note that a Zone Type of Res Garage is also considered a Lowrise Residential occupancy.
Go to the Zone level of the Building Tree and designate the Zone Occupancy selection as any selection in the list other than Single Family or Multi-Family and ensure the Zone Type is not set to Res Garage.
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