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[EnergyPlus_Support] Fatal error for external node



Hi,
I'm trying to model a house with double flow ventilation with heat recovery. I think, I finally got the logic behind the description (not very intuitive for me, any help or procedure would be greatly appreciated...). Anyway, when I run the simulation, I get a fatal error following a severe error reporting : 
"** Severe  ** GetAirflowNetworkInput: No External Nodes found in AirflowNetwork:Multizone:ExternalNode. There must be at least 1 external node defined.
   **  Fatal  ** GetAirflowNetworkInput: Errors found getting inputs. Previous error(s) cause program termination.
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=1
   ..... Last severe error=GetAirflowNetworkInput: No External Nodes found in AirflowNetwork:Multizone:ExternalNode. There must be at least 1 external node defined."
I chose "Surface Average Calculation" in the wind pressure calculation type, and the documentation says, I don't need any externl node in this case.
Can anybody tell me what's wrong.
Thanks in advance.
Adeline



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