Car tutorial skidmarks & wheels are not working

I am very new in Unity3D. Just learning on the Car tutorial.

I find that the skidmarks prefab is not work.
I also try this solution, reset XYZ to 0,0,0, but it not help, below is the screenshot, any recommend?
[22105-image+002.png|22105]

And also the wheel is not rotate while the car is moving, how can improve this?

Thanks you.

I answer my question,

The tutorial is come from 2 error by default…

  1. UnassignedReferenceException: The variable reflectingMaterial of ‘Generate2DReflection’ has not been assigned.
    You probably need to assign the reflectingMaterial variable of the Generate2DReflection script in the inspector.
    Generate2DReflection.Start () (at Assets/Scripts/CSharpScripts/Generate2DReflection.cs:18 )

  2. UnassignedReferenceException: The variable brakeLights of ‘Car’ has not been assigned.
    You probably need to assign the brakeLights variable of the Car script in the inspector.
    Car.GetInput () (at Assets/Scripts/JavaScripts/Car.js:254)
    Car.Update () (at Assets/Scripts/JavaScripts/Car.js:91 )

You should fix these 2 error, the skidmarks and the wheel will works like a charm!