NullReferenceException: Object reference not set to an instance of an object FPSAndroid.Update ()

hello , I was following a tutorial and I was having a few error and some how managed to fix them but now when I run the script I am getting

"NullReferenceException: Object reference not set to an instance of an object
FPS_Android.Update () (at Assets/Scripts/FPS_Android.js:53)
"

here is my script code :-

@script RequireComponent(CharacterController)

var moveTouchPad : Joystick;
var rotateTouchPad : Joystick;

var cameraPivot : Transform;//cam rotate//

//Moving the Player on moving the Touch Pad//

var forwardSpeed : float = 4;
var backwardSpeed : float = 1;
var sidestepSpeed : float = 1;
var jumpSpeed : float = 8;
var inAirMultiplier : float = 0.25; // Reduces Speed of running when u jump and run,used to      make it look more Realistic // 
var rotationSpeed : Vector2 = Vector2( 50, 25 );
var tiltPositiveYAxis : float = 0.6;
var tiltNegativeYAxis : float = 0.4;
var tiltXAxisMinimum : float = 0.1;

private var thisTransform : Transform;
private var character : CharacterController;
private var cameraVelocity : Vector3;
private var velocity : Vector3;
private var canJump = true;

function Start () {
//THIS WILL DEFINE THE COMPONENTS TO SPEED UP LOADING TIME IN THE GAME //
thisTransform = GetComponent(Transform);
character = GetComponent(CharacterController);

//MOVE THE CHARACTER TO THE SPAWN LOCATION IF IT EXISTS//		
var spawn = GameObject.Find("PlayerSpawn");
if(spawn){
	thisTransform.position = spawn.transform.position;

}

}

function OnEndGame(){
moveTouchPad.Disable();

if(rotateTouchPad){
	rotateTouchPad.Disable();
}

this.enabled = false;
}

function Update () {

var movement = thisTransform.TransformDirection(Vector3(moveTouchPad.position.x, 0 ,     moveTouchPad.position.y));
movement.y = 0;
movement.Normalize();

var absJoyPos =     Vector2(Mathf.Abs(moveTouchPad.position.x),Mathf.Abs(moveTouchPad.position.y)); 

if(absJoyPos.y > absJoyPos.x){
	
	if(moveTouchPad.position.y > 0){
		movement *= forwardSpeed * absJoyPos.y;
	}
	else{
		movement *= backwardSpeed * absJoyPos.y;
	}
}
else{
	movement *= sidestepSpeed * absJoyPos.y;

}

if(character.isGrounded){
var Jump = false;
var touchPad : Joystick;

	if(rotateTouchPad){
		touchPad = rotateTouchPad;
	}
	
	else{
	 	touchPad = moveTouchPad;
	} 
	 
	if(!touchPad.IsFingerDown()){
	 	canJump = true;
	}
	 
	if( canJump && touchPad.tapCount >= 2){
	 	velocity = character.velocity;
	 	
	 	velocity.y = jumpSpeed;	
	}
	
	else{
		velocity.y += Physics.gravity.y * Time.deltaTime;
		
		movement.x *= inAirMultiplier;
		movement.z *= inAirMultiplier;
	}
	
	movement += velocity;
	movement += Physics.gravity;
	movement *= Time.deltaTime;
	 
	character.Move(movement);
	
	 if(character.isGrounded){
	 	var camRotation = Vector2.zero;
	 	
	 	if(rotateTouchPad){
	 		camRotation = rotateTouchPad.position;
	 	}
	 	
	 	else{
	 		print(iPhoneInput.acceleration);
	 			var acceleration = Input.acceleration;
	 			var absTiltX = Mathf.Abs(acceleration.x);
	 			
	 			if(acceleration.z < 0 && acceleration.x <0){
	 				
	 				if(absTiltX >= tiltPositiveYAxis){
	 					camRotation.y = (absTiltX -  tiltPositiveYAxis) / (1 - tiltPositiveYAxis);
	 				}
	 				
	 				else if(absTiltX <= tiltNegativeYAxis){
	 					camRotation.y = -(tiltNegativeYAxis - absTiltX) / tiltNegativeYAxis;
	 				}
	 			}
	 			
	 			if(Mathf.Abs(acceleration.y) >= tiltXAxisMinimum){
	 				camRotation.y = -(acceleration.y - tiltXAxisMinimum) / (1 - tiltXAxisMinimum);
	 			}
	 			
	 			camRotation.x *= rotationSpeed.x;
	 			camRotation.y *= rotationSpeed.y;
	 			camRotation *= Time.deltaTime;
	 			
	 			thisTransform.Rotate(0, camRotation.x,0,Space.World);
	 			
	 			cameraPivot.Rotate (-camRotation.y , 0 , 0);
	 			
	 			}
	}
}  
}

Thanks!

This is a really simple error and you probably could have solved it yourself:) This means a variable you used isn’t defined correctly, so I would look in line 53… only 2 variables! thisTransform… you don’t need to declare it, just type Transform instead and he will read the transform of the object the script is attached to.