Play Animation and Sound when enter collider

Hey guys, I've a problem. I have the following script added to a collider but when the player enters the collider nothing happens..'

I tried the two following scripts:

//SCRIPT ONE

 #pragma strict
 
 var playerInArea : boolean = false;
 var jumpscare01fx : AudioClip;
 
  
 function OnTriggerEnter() {
     playerInArea = true;
 }
  
 function OnTriggerExit() {
     playerInArea = false;
 }
 
 if(playerInArea == true) {
 animation.Play("jumpscare01");
 PlaySound();
 }
 
 function PlaySound(){
 audio.clip = jumpscare01fx;
 audio.Play();
 }

//SCRIPT 2

 #pragma strict
 
 var playerInArea : boolean = false;
 var jumpscare01fx : AudioClip;
 
  
 function OnTriggerEnter() {
     playerInArea = true;
 }
  
 function OnTriggerExit() {
     playerInArea = false;
 }
 
 if(playerInArea == true) {
 animation.Play("jumpscare01");
 audio.Play("jumpscare01fx");
 }

Script one simply just doesn't do anything and script 2 gives the following error: BCE0023: No appropriate version of 'UnityEngine.AudioSource.Play' for the argument list '(String)' was found.