Please Help Guys! :( iOS read audio??

Hi guys,
I’ve tried many times but the result is the same.
I’m reading song from the Documents folder.
the song begins to play.
but the second time I try to read, the program closes yourself.

my code:

WWW musicLoader;
IEnumerator audioClipLoad(string link){

    musicLoader = new WWW (link);
    yield return musicLoader;
    myAudio.clip = musicLoader.audioClip;
    myAudio.Play();

}

Is there any other way to the WWW class?

Use code tags please:

How exactly are you reading it for the second time?

Sorry edit it.