I have that car tutorial which is given by unity. I am trying to port it for Iphone/Android. I tried it with accelrometer but I want to use joystick and so that I checked penelope tutorial where i found some basic setup for joystick. But now I am facing pproblem in car game.....

I am adding that joystick code in CarInput script

public Transform joystick; private Transform thisTransform;

void Start() {

 #if UNITY_IPHONE || UNITY_ANDROID

        thistransform=GetComponent(Transform); ..... // Giving error at this line 
        var spawn = GameObject.Find("Player");
       if ( spawn )
         thisTransform.position= spawn.transform.position;

  }
 

void SendInput(CarControl Car)

 {   float steerValue=0.0f;

     float forwardValue=1.0f;

     float reverseValue= 1.0f;
 

if UNITY_IPHONE || UNITY_ANDROID

Vector3 movement= thisTransform.TransformDirection(new Vector3( joystick.position.x, 0.0f, joystick.position.y ) );

     movement.y = 0.0f;

     movement.Normalize();

Vector2 absJoyPos=new Vector2(Mathf.Abs( joystick.position.x ), Mathf.Abs(joystick.position.y ) );

     if ( absJoyPos.y > absJoyPos.x )

 {

     if ( joystick.position.y > 0 )
         movement *= forwardValue * absJoyPos.y;
     else
     {
     movement *= reverseValue * absJoyPos.y;
     }
 }

 else

 {

movement = steerValue absJoyPos.x; }

else

Now if i comment that thisTransform ..GetCOmponent line ... I am getting Null Exception error at run time and joystick is not working ....