Finding things with Raycasthit

Hello :)

I am writing a few functions for Buttons in my game, but no matter what I do I can't seem to get anything with Raycasthit.

At the moment I have two problems:

1st: I wan't to send a message to a script. I'm trying to find it with GetComponent, but I always get this Error: "NullReferenceException: Object reference not set to an instance of an object"

     function Sound1 (){
     var hit : RaycastHit;
     var ray : Ray = Camera.main.ScreenPointToRay(Vector3(Screen.width*0.5, Screen.height*0.5,0));
     var pSound : PSound;
     pSound = hit.collider.gameObject.GetComponent(PSound);
  
         if(Physics.Raycast(ray, hit, 5)){
                 Debug.Log("foundPSound");
                 pSound.SendMessage("PlayS");
              SendMessage("DisMMenu");  
          }
  }

2nd: I want to find the child of a GameObject to enable it. There I get the "NullReferenceExeption" error aswell :(

   function Colour (){
      var hit : RaycastHit;
      var ray : Ray = Camera.main.ScreenPointToRay(Vector3(Screen.width*0.5, Screen.height*0.5,0));
      var col = hit.transform.Find("ColorPicker").gameObject;
         
         if(Physics.Raycast(ray, hit, 5)){
             col.enabled = true;
          }
  }

I have tried changing certain phrases (like "collider" to "transform", or "enabled" to "active", etc) for hours but I seem to get it right.

It would be great if anyone could help me.

Thanks in advance ;)