Error #1069: Property containertype not found on volume and there is no default value.

Hello. I send you all the updated information. I am not able to locate the point you are telling me. I don't quite understand the output panel errors. Remember that the symbol that gives the error is a slider created by me to put volume to the music: an MC with two MC child symbols (knob_mc and line_mc). Curiously, in the first scene the error does not appear and when I put it in other scenes it does.
But it always works well, although with the error in scenes other than the first one.

Error code:

ReferenceError: Error # 1069: Property containertype not found on components.Volume and there is no default value.
at baroqueimprovisation_fla :: MainTimeline / ___ onAdded ___ () [baroqueimprovisation_fla.MainTimeline :: frame1: 156]
at flash.display :: Sprite / constructChildren ()
at flash.display :: Sprite ()
at flash.display :: MovieClip ()
at components :: Volume () [C: \ Users \ josqu \ Desktop \ BI \ app BI \ components \ Volume.as: 19]
at flash.display :: Sprite / constructChildren ()
at flash.display :: Sprite ()
at flash.display :: MovieClip ()
at baroqueimprovisation_fla :: panelmenu_17 ()
at flash.display :: MovieClip / gotoAndPlay ()
at baroqueimprovisation_fla :: MainTimeline / fl_ClickToGoToScene_10 () [baroqueimprovisation_fla.MainTimeline :: frame84: 13

class Classmenu: (although this class works fine without error when I don't put the volume instance in the third scene): is a class to open a menu.

package  componentes{
	
	import flash.display.MovieClip;
	import flash.events.MouseEvent;
	
	public class ClaseMenu {

		public function ClaseMenu(btn:MovieClip, panel:MovieClip, tapa:MovieClip) {
			
			btn.addEventListener (MouseEvent.CLICK, playPanel);
			tapa.addEventListener (MouseEvent.CLICK, removePanel);	
			
			function playPanel (e:MouseEvent): void{
				if (panel.currentLabel == "uno"){
				panel.play();
				tapa.play();	
				}
			}
			function removePanel (e:MouseEvent): void{
				if (panel.currentLabel == "diez"){
				panel.play();
				tapa.play();	
				}
			}
		}

	}
	
}

volume class (the class of the symbol that gives the error). the error starts when I create the class, even though it is empty. I think the class is well done because the symbol works well, although it still gives the error.

package componentes
{
	
	import flash.display.MovieClip;
	import flash.media.SoundTransform;
	import flash.events.MouseEvent;
	import flash.events.Event;
	import flash.media.SoundChannel;
	import flash.geom.Rectangle;
	import flash.media.Sound;

	public class Volumen extends MovieClip
	{
		//private var myChannel:SoundChannel = new SoundChannel ();
		//public var snd:Sound;

			
		public function Volumen()
		{
			
			//snd = new SoundViola;
			//myChannel = snd.play(0, int.MAX_VALUE);
			//knob_mc.addEventListener (Event.ENTER_FRAME, volume_set);
			knob_mc.addEventListener (MouseEvent.MOUSE_DOWN, volume_drag);
			knob_mc.addEventListener (MouseEvent.MOUSE_UP, volume_dragStop);
			knob_mc.addEventListener (MouseEvent.MOUSE_OUT, volume_dragStop);
			knob_mc.x = 40
			}
			
		function volume_drag(evt:MouseEvent):void
		{
		
			knob_mc.startDrag(false, new Rectangle(0,0,line_mc.width-knob_mc.width,0));//se atrastra en esos valores
			}
		
		function volume_dragStop(evt:MouseEvent):void
		{
			knob_mc.stopDrag();
			}
		
		/*function volume_set(evt:Event):void
		{
			var vol:Number = knob_mc.x /100;
			var st:SoundTransform = new SoundTransform(vol);
			myChannel.soundTransform = st;//identifica el sonido
			}*/
	}
	
}

class main does not exist

screenshots of the action panel (there is very little code):

thanks!!