Play animation with Raycast

Hi, So i'm trying to play a animation (open a chest) using raycast.

I'm trying to trigger a function called PlayForward(); with this code:

 var ChestAnim : OpenChest;
 
     function Update () {
          var cam : Transform = Camera.main.transform;
         var ray = new Ray(cam.position, cam.forward);
         var hit : RaycastHit;
         if(Input.GetKeyDown(KeyCode.F)){
         Physics.Raycast (ray, hit, 30);
         Debug.DrawLine (ray.origin, hit.point);
            
            if (hit.collider.tag == "Chest"){
            
            
             ChestAnim = gameObject.GetComponent("OpenChest");
                ChestAnim.PlayForward();
                Debug.Log("your raycast hit door");
             }
                          
          }
     }

And the script on the Chest is:

public var animationClip : AnimationClip;

 function PlayForward()
 {
    animation[animationClip.name].speed = 3.0f;
    animation.Play(animationClip.name);
 }
  
 function PlayBackward()
 {
    animation[animationClip.name].speed = -3.0f;
    animation[animationClip.name].time = animation[animationClip.name].length;
    animation.Play(animationClip.name);
    }

I don't get any errors unitill i press "f" on the chest. Then i get "Object reference not set to an instance of an object RayCast.Update ()" anyone know what the problem is?

Thanks!