im getting this error and i dont know why

ok so i am making this car game and ive checked everything but it all seems fine to me but im getting this error message when running the game

33513-err.png

Please help me i only have 2 days

Initialise in declaration for all variables -

 var Wheel_Right_b : WheelCollider = 0.0f;
 var Wheel_Left_b : WheelCollider = 0.0f;

do this for all WheelCollider declarations.

Red.