At the Zone level of the Building Tree you have set the Occupancy Type to a Nonresidential Occupancy selection. Since you are doing a Lowrise Residential calculation (Residential Title 24 Performance), all occupancies must either be Single Family or Multi-Family. Any other selections in that list fall under Nonresidential occupancies.
Go to the Zone level of the Building Tree and designate the Zone Occupancy selection as either Single Family or Multi-Family.
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