Connect chilled beams to air loop [3D Plus]

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I'm stuggling to model a chilled beam system in Trane 3D Plus. Even when I select passive chilled beams it throws an error: "AirLoopHVAC RR 2 _Passive Chilled Beams has no air flow".

The room is a restroom but should have airflow right? Other systems with airflow ex. PFP VAV works and produces good results.