Method not found: 'UnityEngine.AudioSource.PlayOneShoot'.

I can`t understand where i wrong. Have any ideas where i wrong in var or or idk..

 var Range : float = 1000;
             
 var Force : float = 1000;
 
 var Clips : int = 20;
 
 var BulletPerClip : int = 60;
 
 var ReloadTime : float = 3.3;
 
     var BulletsLeft : int = 0;
     
         var ShootTimer : float = 0;
         
         var ShootCooler : float = 0.9;
         
         public var ShootAudio : AudioClip;
         
         public var ReloadAudio : AudioClip;

function Start(){

 BulletsLeft = BulletPerClip;

}

function Update () {

 if( ShootTimer > 0){
     
 ShootTimer -= Time.deltaTime;

 }
 
 if( ShootTimer <0){
 
     SmoothTimer =0;   

}

 if(Input.GetKey(KeyCode.F)){
 if(ShootTimer == 0){
 
 
 PlayShootAudio();   
     RayShoot();
 
     ShootTimer = ShootCooler;

}
} }

function RayShoot (){

     var Hit : RaycastHit;
     
             var DirectionRay = transform.TransformDirection(Vector3.forward);
             
             Debug.DrawRay(transform.position , DirectionRay * Range , Color.blue);
             if(Physics.Raycast(transform.position , DirectionRay , Hit, Range)){
             
             if(Hit.rigidbody){
             
             Hit.rigitbody.AddForceAtPosition( DirectionRay * Force , Hit.point);
             

} } BulletsLeft --;

 if(BulletsLeft < 0){
 
 BulletsLeft = 0;
 
 }
 
 if( BulletsLeft == 0 ){
 
 Reload();
 
 
 }

}

function Reload (){

     PlayReloadAudio();
 yield WaitForSeconds( ReloadTime);
 
     if(Clips > 0){
     
         BulletsLeft = BulletPerClip;
     

} }

function PlayShootAudio(){

         audio.PlayOneShoot( ShootAudio);

}

function PlayReloadAudio(){

 audio.PlayOneShoot( ReloadAudio);

}