Don'tDestroyOnLoad issue, please help :(

I have this script in a manager GameObject.

 var musicAudio : AudioClip;
 
 function Start () {
     audio.PlayOneShot(musicAudio);
 }
 
 function Awake () {
     DontDestroyOnLoad (this);
 }

and this one in a trigger that changes the level.

 var level : int;
 
 function OnTriggerEnter (other : Collider) {
     if(other.gameObject.CompareTag("Player")){
         Application.LoadLevel(level);
     }
 }

But when the player enters the trigger, nothing happens. I tried without the manager script, and it worked perfectly. But when I use it, notfing happens. Any help guys?

hthanks in advance! :)