Flash error in AS3. Use a button to stop a sound.

Hi,

I have the following code:

import flash.net.URLRequest;

import flash.media.Sound;

import flash.media.SoundChannel;

import flash.events.Event;

import flash.events.MouseEvent;

var ruta:URLRequest=new URLRequest("afternoonnaps.wav");

var sonido:Sound = new Sound();

var canal:SoundChannel = new SoundChannel();

sonido.load(ruta);

sonido.addEventListener(Event.COMPLETE, carga);

function carga(event:Event):void {

detener_btn.addEventListener(MouseEvent.CLICK, detener);

}

function detener(event:MouseEvent):void {

canal.stop();

}

I want to stop a sound with a button and this is the error that I get:

Error #2044: IOErrorEvent Unhandled: text=Error #2032: Sequence or Stream error.

at web17_fla::MainTimeline/frame10()

Please, Can you help me?.