What's wrong with my code? (Airtap to play AudioSource MixedRealityToolkit)

Hi, I'm using Unity 2017 and what I believe is close to the most recent version of MRTK. I'm trying to get it to where i tap on an object and it plays an audio file. I have a similar problem getting an audio file to play with the Speech Input Source and Handler so i believe my problem is with the audio code. Any ideas? Here's my code:

`using HoloToolkit.Unity.InputModule;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AirTap_PlayAudio : MonoBehaviour {

// Use this for initialization
public AudioSource audioSource;

void Start () {
    if (audioSource == null) { // if AudioSource is missing
        Debug.LogWarning ("AudioSource component missing from this gameobject. Adding one.");
        // let's just add the AudioSource component dynamically
        audioSource = gameObject.AddComponent<AudioSource> ();

    }
}

    #region IInputClickHandler
    public void OnInputClicked(InputClickedEventData eventData)
    {
    audioSource.Play();
    }
    #endregion IInputClickHandler

// Update is called once per frame
void Update () {

}

}
`