Why PlayOneShot is not working? C#

I have tried everything, but I can't find why. Here is the script:

 public AudioClip clip;
 private AudioSource fx;
 GameObject music;

 void Awake() {
     fx = GameObject.Find("_GM").GetComponent<AudioSource>();
     music = GameObject.Find("_music");
 }

 IEnumerator ChangeLevel () {
         float fadeTime = GameObject.Find("_GM").GetComponent<Fading>().BeginFade(1);
         yield return new WaitForSeconds(fadeTime);
     SceneManager.LoadScene(2);
 }

 void OnTriggerEnter2D (Collider2D col) {
     if (col.gameObject.tag == "center") {
         StartCoroutine(ChangeLevel());
         fx.PlayOneShot(clip, 1f);
         Destroy(music);
     }
 }

}