When I tried to add fluid subdomain and boundary condition on this heat exchanger it is show that "Could not find the faces associated with this problem . How can i solve this problem ?

I am trying to do a flow simulation in the heat exchanger with air ans water mixture . But When I try to add fluid sub domain or boundary condition it is showing that Faces are not associated with this item. How to solve this problem? I am also adding the file attached below .

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