Unexpected error when computing the force in the x direction

Hi there,
I am new to ANSYS Discovery, and I was attempting to compute the drag force experienced on a design my team created for the F1 in Schools competition. I received the following error, and I cannot figure out how to fix it, "Select one or more faces on wall location for Drag Force. (129 Faces)". I have attached a screenshot of the error to this question. Any help given on this matter would be appreciated greatly.
Thanks,
Conor.
Answers
You did not select the wall where you want to calculate the drag
Thank you!
@YasserSelima As in one of the walls of the enclosure, or is it something else? If it is one of the walls of the enclosure, which one?
All of them,you want to find the drag on the car, so you need to select all the walls forming the car.
@YasserSelima My problem is that I clicked on the walls of the car. I have attached a video of what I did for reference. I am probably doing something very stupid, so, sorry in advance.
Try selecting the walls after you click xforce17
@YasserSelima That doesn't seem to work unfortunately. I will attach a link to the DSCO file here: https://drive.google.com/file/d/1jF1jp814-eAW8oFnL3u61JUMiF0sqamR/view?usp=sharing.