Sound script problem.

I don't know C or java but i wrote a script like this

     var player : GameObject; 
 
 var crashSound : AudioClip;
 
 function Start () { player = GameObject.FindGameObjectWithTag("Player");
     
      if (!player)
           Debug.Log ("ERROR could not find Player!");
     
     }
     
     function Update() { if (!player) return;
     
      var distance = Vector3.Distance( player.transform.position, transform.position);
     
      if ( distance < 20  )  {
           Debug.Log ("player is close");
     
     	 audio.PlayOneShot(crashSound); }
     
     }

so i want my player to hear a sound when he get near an object. But when i try to use my script i get an error like this :

MissingComponentException: There is no 'AudioSource' attached to the "OogieBoogie" game object, but a script is trying to access it. You probably need to add a AudioSource to the game object "OogieBoogie". Or your script needs to check if the component is attached before using it. UnityEngine.AudioSource.PlayOneShot (UnityEngine.AudioClip clip) nearsound.Update () (at Assets/nearsound.js:18)

So where is my mistake ?