I just want to generate the Mesh and I get the following error (? it look like an error but I don’t know)
The physics can not be taken into account as the simulation setup is not valid. Complete your simulation setup before generating the mesh in order to optimize the mesh for your application.
I hope you can help me.
regards
sascha
Hello Sascha, welcome and thanks for using the forum!
The cause of the error is that you have the inlet and outlet faces assigned to two boundary conditions each. Please remove the Natural Convection Inlet/Outlet item, and specify all the info (Tempearture, Pressure, Flow) in our Fan Outlet/Fan inlet conditions).
Thanks 
This is it.