Your system type has been input as a Variable Air Volume system, which allows the airflow to be modulated down to a minimum airflow during low load conditions, However, code does not allow that airflow to drop below the minimum ventilation rate for the zones served.
To fix this, go into the Central System Library, and select your HVAC system. At the Fans tab, increase the Minimum Airflow to be at or above the code requirement for Ventilation.
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