Error during simulation run for cfd analysis of formula student car

this is the error I keep getting,
" A setup with at least 4 regions is being used in a single-region analysis type. Please make sure that all regions except for one have an Advanced Concept assigned to them."
here is the link SimScale Login

Hey there, and thanks for using the forum!

After you create the flow region, you need to delete the solid parts, as they are not part of the flow simulation.

You can do this with a Body - Delete operation in the CAD Edit mode.

Please also refer to the workflow in this tutorial: