A simulation error message

“A setup with at least 2 regions is being used in a single-region analysis type. Please delete CAD regions that are irrelevant for the simulation. If all CAD regions are relevant, ensure that only one region is assigned to the material and that all other bodies are assigned to advanced concepts.”

I have got this message, while I was trying to do a simulation of my F1 car, can someone pls view my project and guide where did I go wrong?
link is given below:-

Hello @vvoyagers , and thanks for posting your question on the Forum!

Please make sure that your solid parts are deleted by using Body/Delete operation in the CAD mode after you create the flow region. Incompressible simulation type only needs the flow region; your solids now will be represented by their boundaries as walls in your simulation.

Best wishes, Kaan