I was coding and figuring out speeds in unity then this error came up and said something about the backwards speed, and I don’t see any problems with it… could any one of you guys help me with thisk, I have been looking on this for hours so if anyone could take some time and help me that would be great! 
Here is the error and down below that is my code (it is JavaScript! :)):
MissingFieldException: CharacterMotorMovement.maxbackwardsSpeed
Boo.Lang.Runtime.DynamicDispatching.PropertyDispatcherFactory.FindExtension (IEnumerable`1 candidates)
Boo.Lang.Runtime.DynamicDispatching.PropertyDispatcherFactory.Create (SetOrGet gos)
Boo.Lang.Runtime.DynamicDispatching.PropertyDispatcherFactory.CreateSetter ()
Boo.Lang.Runtime.RuntimeServices.DoCreatePropSetDispatcher (System.Object target, System.Type type, System.String name, System.Object value)
Boo.Lang.Runtime.RuntimeServices.CreatePropSetDispatcher (System.Object target, System.String name, System.Object value)
Boo.Lang.Runtime.RuntimeServices+c__AnonStorey18.<>m__D ()
//My CODE!!
var PlayerState : float;
var PlayerAnimations : GameObject;
var PlayerMotor : CharacterMotor;
var WalkingSpeed : float = 6; // The walking speed.
var SprintingSpped : float = 10; // The sprinting speed.
function Update ()
{
PlayerStateController();
PlayerAnims();
}
function PlayerStateController()
{
if((Input.GetAxis(“Vertical”) !=0 || Input.GetAxis(“Horizontal”) !=0))
{
if (Input.GetButton(“sprint”))
{
PlayerState = 2;
}
else
{
PlayerState = 1;
}
}
else
{
PlayerState = 0;
}
} //End PlayerStateController.
function PlayerAnims()
{
if (PlayerState == 0)
{ // you can say animation.play to see a diffrence
PlayerAnimations.animation.CrossFade(“IdleBarrettm85”, 0.4); //Smothness is 0.4 so that the transactin between the two are smotthend
}
else if (PlayerState == 1)
{
PlayerAnimations.animation.CrossFade(“WalkBarrettm85”, 0.4); //Smothness is 0.4
PlayerMotor.movement.maxForwardSpeed = WalkingSpeed; //max forward walking speed (!!as the variable above!!)
PlayerMotor.movement.maxSidewaysSpeed = WalkingSpeed/2; //max sideways walking speed (!!as the variable above divided by two!!)
PlayerMotor.movement.maxbackwardsSpeed = WalkingSpeed; //max backwards walking speed (!!as the variable above!!)
}
else if (PlayerState == 2)
{
PlayerAnimations.animation.CrossFade(“SprintBarrettm85”, 0.4); //Smothness is 0.4
PlayerMotor.movement.maxForwardSpeed = SprintingSpped; //max forward sprinting speed (!!as the variable above!!)
PlayerMotor.movement.maxSidewaysSpeed = SprintingSpped/2; //max sideways sprinting speed (!!as the variable above divided by two!!)
PlayerMotor.movement.maxbackwardsSpeed = SprintingSpped; //max backwards sprinting speed (!!as the variable above!!)
}
}
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