Unity 3D Audio Clip Disabled

Hello,

I am attempting to make a sound clip play when I destroy an enemy in a space shooter type game. However it keeps giving me the following message: Can not play a disabled audio source UnityEngine.AudioSource:PlayOneShot(AudioClip) EnemyControllerBasic:OnTriggerEnter(Collider) (at Assets/Stewart_Tafari_Lab2/Scripts/EnemyControllerBasic.cs:36).

Any idea why it is doing this?

using UnityEngine; using System.Collections;

public class EnemyControllerBasic : MonoBehaviour {

 // The game object which spawns us. 
 private ShipPlayerController PlayerShipCtrl;
 // The game object which spawns the projectile.
 private Mover Bolt;
 // The different IDs for the AI states
 enum AIMode { Normal, Ramming, SteerTowards, Charge };
 // The variable which holds the current AI state
 private AIMode CurrentAIState;
 // Holds the audio clip to play when 
 // this object is destroyed
 [SerializeField]AudioClip blowupSfxClip;
 // List of pickup TYPES to spawn
 [SerializeField]GameObject[] PickupTypes;
 // Used to control how fast the game object moves
 [SerializeField]float MoveSpeed = 4.0f;
 // The speed to use when in "ramming" mode
 [SerializeField]float RamSpeed = 5.0f;
 // The speed to use when in "charge" mode
 [SerializeField]float ChargeSpeed = 6.0f;

 // Called by the engine when this object collides
 // with another object containing collision
 void OnTriggerEnter (Collider other) {
 
     // Hit the player's projectile?
     if (other.tag == "PlayerProjectile") {
                     
                     // A projectile= instant kills us
                     Destroy(gameObject);
                     // play the blowup audio sfx file
                     audio.PlayOneShot(blowupSfxClip);
                     // Drop a pickup
                     SpawnPickup ();

         }
     // Hit the player's ship?
     else if (other.tag == "PlayerShip") {
                     
                     // Wrecking with the player kills us
                     Destroy(gameObject);
     
                     // Remove points from the player for hitting the enemy
                     PlayerShipCtrl.ModScore (-1);

                     // Remove shield from the player for hitting the enemy
                     PlayerShipCtrl.ModShield (-1);
                     
                     // Remove health from the player for hitting the enemy
                     PlayerShipCtrl.ModHealth(-1);
             }
         
 }