RandomSoundplayer wont load

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class RandomPlayerEdi : MonoBehaviour {

    private AudioSource audioSource;
    [SerializeField]
    private List<AudioClip> soundClips = new List<AudioClip>();
    [SerializeField]
    private float soundTimerDelay = 3f;
    private float soundTimer;

    // Use this for initialization
    void Start () {
        audioSource = GetComponent<AudioSource> ();
    }

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

        // Increment a timer to count up to restarting.
        soundTimer = soundTimer + Time.deltaTime;

        // if time timer reaches the delay...
        if (soundTimer >= soundTimerDelay) {

            // ...reset the timer...
            soundTimer = 0f;

            //...choose a ramdom sound...
            AudioClip randomSound = soundClips[Random.Range (0, soundClips.Count)];

            //...and play the sound.
            audioSource.PlayOneShot (randomSound);

        }

    }
}