Player Rotation with the mouse

Hello everyone and thank you for helping me, I'm actually blocked with a simple thing like the player rotation. I followed this tutorial "https://unity3d.com/learn/tutorials/projects/survival-shooter/player-character" and I don't understand why my player won't rotate. Here is the script :

     #pragma strict
 
     var speed : float = 6f;
     
     private var playerRigidbody : Rigidbody;
     private var movement : Vector3;
     private var camRayLength : float = 100f;
     private var floorMask : int;
 
 function Awake () 
 {
     floorMask = LayerMask.GetMask("Floor");
     playerRigidbody = GetComponent(Rigidbody);
 }
 
 function FixedUpdate () 
 {
     var h : float = Input.GetAxisRaw("Horizontal");
     var v : float = Input.GetAxisRaw("Vertical");
     
     // Move the player
     
     Move(h, v);
     
     //Turning the player
     
     Turning();
 }
 
 function Move (h : float, v : float)
 {
     movement.Set(h, 0f, v);
     movement = movement.normalized * speed * Time.deltaTime;
     playerRigidbody.MovePosition(transform.position + movement);
 }
 
 function Turning ()
 {
     var camRay : Ray = Camera.main.ScreenPointToRay(Input.mousePosition);
     var floorHit : RaycastHit;
     if(Physics.Raycast(camRay, floorHit, camRayLength, floorMask))
     {
         var playerToMouse : Vector3 = floorHit.point - transform.position;
         playerToMouse.y = 0f;
         
         var newRotation : Quaternion = Quaternion.LookRotation(playerToMouse);
         
         playerRigidbody.MoveRotation(newRotation);
     }
 }
 

Thanks again :)