I am trying to replace an existing HVAC system (VAV with Chiller) with VRF system. Simulation runs well but gets following error "User did not pick any zone to be added to VRF". I don't know how to resolve this error. Please advice.

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Javed, this might be to obvious, but make sure you checked the box for each space type you want to be on the VRF system. It is also picky about building stories. You need to make sure that you have stories in your model and that each story includes a conditioned zone.