error with maxbackwardsSpeed

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!!) } }