Error BCE0023 when using script for main menu

Hi, I'm trying to apply sounds when I either enter a 3d text with my mouse, or exit it. However, I get this error, /Assets/Scripts/TextControl.js(13,11): BCE0023: No appropriate version of 'UnityEngine.AudioSource.Play' for the argument list '(String)' was found. Here's my script:

 var isQuitButton = false;
 var LoadCamTime : float = 3;
 var CamObj : GameObject;
 var EnterS : AudioClip;
 var Exit1 : AudioClip;
 
 
 
 function OnMouseEnter ()
 { 
 
 renderer.material.color = Color.red;
 audio.Play("EnterS");
 }
 
 
 function OnMouseExit ()
 { 
 
 renderer.material.color = Color.white;
 audio.Play("Exit1");
 }
 
 
 function OnMouseUp ()
 {
 
 
 
 
 
 
 if(isQuitButton) 
 {
 Application.Quit();
 }
 
 else
 
 CamObj.animation.Play("LoadCamLev1");
 yield WaitForSeconds(LoadCamTime);
 Application.LoadLevel(1);
 
 }