1023: Incompatible Override HELP!

programming flash
1

Hey guys, when i run my flash i get 2 errors saying 1023: Incompatible override. And i have no idea how to fix it. Here is my code:

GreenMN.visible = false;
GreenSBW.visible = false;
GreenCS.visible = false;

error.visible = false;

MNandSBW.visible = false;
MNandCS.visible = false;
SBWandCS.visible = false;

/////////////////////////////////////////////////////////////////////////

MN.addEventListener(MouseEvent.CLICK, MN1);
function MN1(event:MouseEvent):void
  { 
     if (GreenMN.visible == true) {
		 
		 GreenMN.visible = false;

		 } else {
			 
	     GreenMN.visible = true; 
		 }
		 
     if (GreenMN.visible && GreenSBW.visible == true) {
	
	     MNandSBW.visible = true; 
 
         }

     if (GreenSBW.visible && GreenMN.visible == false) {
	
	     MNandSBW.visible = false; 	 
		 }
		 
	if (GreenCS.visible && GreenMN.visible == false) {
	
	     MNandCS.visible = false; 	 
		 }	
		 
	if (GreenCS.visible && GreenMN.visible == true) {
	
	     MNandCS.visible = true; 	 
		 }		
		 
	 if (GreenMN.visible && GreenCS.visible && GreenSBW.visible == true) {
	
	     MNandCS.visible = false; 
		 SBWandCS.visible = false;
		 MNandSBW.visible = false;
		 
		 error.visible = true;
          } else {
			  error.visible = false;
			
		  }	 
		 
  }
 
  
/////////////////////////////////////////////////////////////////////////

SBW.addEventListener(MouseEvent.CLICK, MN2);
function MN2(event:MouseEvent):void
  { 
     if (GreenSBW.visible == true) {
		 
		 GreenSBW.visible = false;

		 } else {
			 
	     GreenSBW.visible = true; 
		 }
		 
     if (GreenMN.visible && GreenSBW.visible == true) {
	
	     MNandSBW.visible = true; 
         }

     if (GreenMN.visible && GreenSBW.visible == false) {
	
	     MNandSBW.visible = false; 	 
		 }
		 
	 if (GreenSBW.visible && GreenCS.visible == true) {
	
	     SBWandCS.visible = true; 	 
		 }
		 
	 if (GreenSBW.visible && GreenCS.visible == false) {
	
	     SBWandCS.visible = false; 	 
		 }		
		 
	 if (GreenCS.visible && GreenSBW.visible == false) {
	
	     SBWandCS.visible = false; 	 
		 }		
		 
	 if (GreenMN.visible && GreenCS.visible && GreenSBW.visible == true) {
	
	     MNandCS.visible = false; 
		 SBWandCS.visible = false;
		 MNandSBW.visible = false;
		 error.visible = true;
          } else {
			  error.visible = false;
		  } 
		 
  }
  
/////////////////////////////////////////////////////////////////////////  
  
CS.addEventListener(MouseEvent.CLICK, MN3);
function MN3(event:MouseEvent):void
  { 
     if (GreenCS.visible == true) {
		 
		 GreenCS.visible = false;

		 } else {
			 
	     GreenCS.visible = true; 
		 }
		 
     if (GreenMN.visible && GreenCS.visible == true) {
	
	     MNandCS.visible = true; 
         }

     if (GreenMN.visible && GreenCS.visible == false) {
	
	     MNandCS.visible = false; 	 
		 } 
		 
      if (GreenSBW.visible && GreenCS.visible == true) {
	
	     SBWandCS.visible = true; 	 
		 } 
		 
		if (GreenSBW.visible && GreenCS.visible == false) {
	
	     SBWandCS.visible = false; 	 
		 }  
		 
		  if (GreenMN.visible && GreenCS.visible && GreenSBW.visible == true) {
	
	     MNandCS.visible = false; 
		 SBWandCS.visible = false;
		 MNandSBW.visible = false;
		 error.visible = true;
		 
		  } else {
			  error.visible = false;
		  }
         
  }
 
 
/////////////////////////////////////////////////////////////////////////  

  MN.addEventListener(Event.ENTER_FRAME, fl_FadeSymbolIn_1);
MN.alpha = 0;

function fl_FadeSymbolIn_1(event:Event)
{
	MN.alpha += 0.04;
	if(MN.alpha >= 1)
	{
		MN.removeEventListener(Event.ENTER_FRAME, fl_FadeSymbolIn_1);
	}
}

SBW.addEventListener(Event.ENTER_FRAME, fl_FadeSymbolIn_2);
SBW.alpha = 0;

function fl_FadeSymbolIn_2(event:Event)
{
	SBW.alpha += 0.04;
	if(SBW.alpha >= 1)
	{
		SBW.removeEventListener(Event.ENTER_FRAME, fl_FadeSymbolIn_2);
	}
}

CS.addEventListener(Event.ENTER_FRAME, fl_FadeSymbolIn_3);
CS.alpha = 0;

function fl_FadeSymbolIn_3(event:Event)
{
	CS.alpha += 0.04;
	if(CS.alpha >= 1)
	{
		CS.removeEventListener(Event.ENTER_FRAME, fl_FadeSymbolIn_3);
	}
}

////////////////////////////// MOUSE ON/Over ////////////////////////////////////

CS.addEventListener(MouseEvent.MOUSE_OVER, fl_MouseOverHandler);

function fl_MouseOverHandler(event:MouseEvent):void
{
	CS.alpha = 0.2;
}


CS.addEventListener(MouseEvent.MOUSE_OUT, fl_MouseOutHandler1);

function fl_MouseOutHandler1(event:MouseEvent):void
{
	CS.alpha = 1;
}

MN.addEventListener(MouseEvent.MOUSE_OVER, fl_MouseOverHandler3);

function fl_MouseOverHandler3(event:MouseEvent):void
{
	MN.alpha = 0.2;
}


MN.addEventListener(MouseEvent.MOUSE_OUT, fl_MouseOutHandler4);

function fl_MouseOutHandler4(event:MouseEvent):void
{
	MN.alpha = 1;
}

SBW.addEventListener(MouseEvent.MOUSE_OVER, fl_MouseOverHandler5);

function fl_MouseOverHandler5(event:MouseEvent):void
{
	SBW.alpha = 0.2;
}


SBW.addEventListener(MouseEvent.MOUSE_OUT, fl_MouseOutHandler6);

function fl_MouseOutHandler6(event:MouseEvent):void
{
	SBW.alpha = 1;
}

//////////////////////


CSinfo.visible = false;


CS.addEventListener(MouseEvent.MOUSE_OVER, fl_MouseOverHandler_3);

function fl_MouseOverHandler_3(event:MouseEvent):void
{
	CSinfo.visible = true;
}

CS.addEventListener(MouseEvent.MOUSE_OUT, fl_MouseOutHandler_2);

function fl_MouseOutHandler_2(event:MouseEvent):void
{

	CSinfo.visible = false;

}