Unity 2D Collider did not create any collision shapes as they all failed verification

I am trying to make a 2d topdown car game but whenever I add a collider a message appears saying:

 "The collider did not create any collision shapes as they all failed verification. This could be because they were deemed too small or the vertices were too close. Vertices can also become close under certain rotations or very small scaling."

I am pretty sure it is because I have rotated the car 90degrees on the X axis but I can't change that as I need that for the top down game. I've looked but haven't found a solution for this error.