Move towards touch position

I am kind a new to unity and JS so this may be a stupid question but I have been searching for hours to find an answer, still no succes :/

I am working on a small game where the player needs to go hit objects (the object has a bounce) currently I am using this wasd script to test the game on a desktop, this one works perfectly fine.

 var moveUp : KeyCode;
 var moveDown : KeyCode;
 var moveLeft : KeyCode;
 var moveRight : KeyCode;
 
 static var speed : float = 10;
 
 function Update () {
     if (Input.GetKey(moveUp))
     {
         rigidbody2D.velocity.y = speed;
     }
     
     else if (Input.GetKey(moveDown))
     {
         rigidbody2D.velocity.y = speed * -1;
     }
     
     else if (Input.GetKey(moveLeft))
     {
         rigidbody2D.velocity.x = speed * -1;
     }
     
     else if (Input.GetKey(moveRight))
     {
         rigidbody2D.velocity.x = speed;
     }
     
     else
     {
         rigidbody2D.velocity.y = 0;
         rigidbody2D.velocity.x = 0;
     }
 }

At this moment I am working on the following script for touch controls, unfortunately it shows the following error "BCE0017: The best overload for the method 'UnityEngine.Vector3.MoveTowards(UnityEngine.Vector3, UnityEngine.Vector3, float)' is not compatible with the argument list '(float, float, float)'."

If someone could please help me solve this script I would really appriciate it.

 var speed : float = 10;
 var pos : Vector3;
 
 function Start (){
     Screen.sleepTimeout = SleepTimeout.NeverSleep;
 }
 
 function Update(){
     MoveUpdate();
 }
 
 function MoveUpdate(){
 
     if (Application.platform == RuntimePlatform.Android){
         pos = Camera.main.ScreenToWorldPoint(Vector3(Input.GetTouch(0).position.x, Input.GetTouch(0).position.y));
     }
     
     
     
     else{
         pos = Camera.main.ScreenToWorldPoint(Vector3(Input.mousePosition.x, Input.mousePosition.y));
     }
     
     
     transform.position = Vector3.MoveTowards(pos.x,pos.y, speed);
     
 }
 

Thanks!