Cant repeat Sound

So i made an Entertrigger Exittrigger sound system where i can walk into a triggered collider and it will play sound while i'm in that collider and stop when i leave the collider. The problem i'm having is that i can only play the audio clip once and when i tried to change it to repeat it wouldnt work saying

Assets/GameObjects/HomemadeScripts/SOundCry.js(21,19): BCE0023: No appropriate version of 'UnityEngine.AudioSource.Play' for the argument list '(UnityEngine.AudioClip)' was found.

Can someone please tell me where i'm going wrong?

here's the code

 #pragma strict
 
 
 
 var flushClip:AudioClip;
 
 var isFlush = false;
 
 
 
 function OnTriggerEnter(o:Collider){
 
     Debug.Log("The trigger fired enter");
 
     isFlush = true;
 
     
 
     if(isFlush == true){
 
         playFlush();
 
     }
 
 }
 
 
 
 function OnTriggerExit(o:Collider){
 
     Debug.Log("The trigger fired");
 
     
 
 }
 
 
 
 function playFlush(){
 
     audio.Play(flushClip);
 
     isFlush = false;
 
 }

Thanks in advance :)