Sounds like for both your solar collector and AAHX, you have used the same name as inlet air node (AIR INTAKE NODE) and outlet air node (AIR OUTLET NODE). Right now, EnergyPlus thinks you're using "AIR INTAKE NODE" in two different inlet locations in your model and "AIR OUTLET NODE" in two different outlet locations in your model.

For each component in your model, node names need to be unique UNLESS there are inlet / outlet connection relationships. unique. Try changing the input fields to be "COLLECTOR AIR INTAKE NODE" and "COLLECTOR AIR OUTLET NODE" for your unglazed solar collector. Since outlet air from the collector is inlet air to the AAHX, you should set the inlet air input field of your AAHX object to "COLLECTOR and "AAHX AIR OUTLET NODE". To have a unique outlet air node name, change the outlet air input field of your AAHX object to INTAKE NODE" and "AAHX AIR OUTLET NODE".NODE" for your unglazed solar collector.