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There have been previous questions on the topic such as here and here.

Looking at your model, you have two AirLoopHVAC:UnitarySystem objects, and each houses four components: a Fan:OnOff, a Coil:Cooling:WaterToAirHeatPump:EquationFit, a Coil:Heating:WaterToAirHeatPump:EquationFit and a Coil:Heating:Electric (the reheat).

OpenStudio doesn't create the inner nodes between these components until Forward Translation happens, which means you cannot use "Setpoint" mode with a Unitary that houses more than one component.

So you have two options:

• Use a unitary with many components, but use the "Load" control (there have been problems in simulation times reported in one of the questions I linked)
• Use one unitary system to wrap your Coil:Cooling:WaterToAirHeatPump:EquationFit and one unitary forCoil:Heating:WaterToAirHeatPump:EquationFit, put as "Septoint" mode an place a setpoint manager on the outlet node.