Truck not moving and tires not rotating on spline

Hello,

I am new to this side of Unreal. I am following an older UE tutorial where they show us how to procedurally rotate the tires of a vehicle while it moves on a camera rig rail. Its an interesting approach to animating a vehicle since it takes out the need to keyframe the rotation in seq. Here is the tut I am referring to - Animation in Unreal Engine: Adding Life to Your Story | Webinar - YouTube

It seems easy enough however, I believe I have followed the instructions exactly as stated but my vehicle does not move nor do the tires rotate. Here is a screenshot of my script. Any help would be greatly appreciated.