You have selected an HVAC System that is a Hydronic Heating System, which can only be modeled by the CEC CBECC engine if the heating boiler is Gas Fired (not a Heat Pump or Electric Resistance boiler). In this case you are using are not using a Gas Fired unit for the boiler and this cannot be modeled.
Either change your system type to a Non-Hydronic system at the System level of the Tree, General tab, or at the Plant level of the tree, Heating Hot Water Tab, select a Boiler that is Gas Fired.
The approach to model an Electric boiler or Heat Pump Water Heater that provides space heating is to treat it as an electric space heater, and indicate no ducts. This is a CEC rule, not a program limitation, so you should consider an alternative system.
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