HVAC Setup Help with Air Loop

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I'm trying to set up my own HVAC system and am getting errors as listed below. The system should have Fan SystemModel, Coil Heating Fuel, and Coil Cooling DX SingleSpeed on the supply side. On the demand side, I have one zone and a AirTerminal:SingleDuct:ConstantVolume:NoReheat. I added the diffuser first, then the zone, by clicking on the side branch to the right of the diffuser and then selecting the zone in the side bar. I also added a temperature set point controller. Any ideas on what I could be doing wrong here?

Picture of the current set up below.

Error File Screenshot