This happens when you duplicate a simulation setup and change the base mesh. Just like the boundary conditions and material assignment, you should always select the entities that go with that attribute. In this case we have a result control item for the main wing and the flap, and additionally we have some field calculations.
Specifically for the main wing and flap, you just need to go to the control item and select the topological entity that you want (i.e. the face that you want). If you’re not sure how to do this please refer to the Result Control section within the tutorial.
Hope this helps!