Help to decipher error code.. Error #1009

programming flash
1

Hi there,

I’ve got an error code:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at Page4_fla::MainTimeline/frame13()[Page4_fla.MainTimeline::frame13:25]

This appears each time I clicked on the “next” button in the second .swf file. But I can’t identify the source of my error. Could you help?

[COLOR=Blue]stop[/COLOR]();

[COLOR=Blue]var[/COLOR] myBoundaries:[COLOR=Blue]Rectangle[/COLOR]=[COLOR=Blue]new Rectangle[/COLOR](431,409.5,0.1,-15);
//to constrain the movement of MGAswitch.
[COLOR=Blue]var[/COLOR] myLoader:[COLOR=Blue]Loader[/COLOR]=[COLOR=Blue]new Loader[/COLOR] ();

MGAswitch.[COLOR=Blue]addEventListener[/COLOR]([COLOR=Blue]MouseEvent.MOUSE_DOWN[/COLOR],dragSwitch);
[COLOR=Blue]function[/COLOR] dragSwitch([COLOR=Blue]event[/COLOR]:[COLOR=Blue]MouseEvent[/COLOR]):[COLOR=Blue]void[/COLOR] {
    MGAswitch[COLOR=Blue].startDrag[/COLOR]([COLOR=Blue]false[/COLOR],myBoundaries);
//Starts the response to mousedrag.
}[COLOR=Blue]
stage.addEventListener[/COLOR]([COLOR=Blue]MouseEvent.MOUSE_UP[/COLOR],dropSwitch2a);
[COLOR=Blue]function[/COLOR] dropSwitch2a([COLOR=Blue]event[/COLOR]:[COLOR=Blue]MouseEvent[/COLOR]):[COLOR=Blue]void[/COLOR] {
    MGAswitch[COLOR=Blue].stopDrag[/COLOR]();
//Stops the mousedrag.
   [COLOR=Blue] if[/COLOR] ((MGAswitch.[COLOR=Blue]hitTestObject[/COLOR](targetArea))) {
        //trace("success");

        [COLOR=Blue]var[/COLOR] myURL:[COLOR=Blue]URLRequest[/COLOR]=[COLOR=Blue]new URLRequest[/COLOR]([COLOR=DarkGreen]"page3.swf"[/COLOR]);
        myLoader[COLOR=Blue].load[/COLOR](myURL);
        [COLOR=Blue]addChild[/COLOR](myLoader);
    }
}
/*If the MGAswitch movieclip hits the "targetarea", which is the "On" position, 
then it will trigger a loader of the next .swf file.*/

targetArea[COLOR=Blue].addEventListener[/COLOR]([COLOR=Blue]Event.ENTER_FRAME[/COLOR], hitTest);
[COLOR=Blue]function[/COLOR] hitTest(yourEvent:[COLOR=Blue]Event[/COLOR]):[COLOR=Blue]void[/COLOR] {
}

[COLOR=Blue]stop[/COLOR]();

[COLOR=Blue]var[/COLOR] myLoader:[COLOR=Blue]Loader[/COLOR]=[COLOR=Blue]new Loader[/COLOR] ();

next_btn[COLOR=Blue].addEventListener[/COLOR]([COLOR=Blue]MouseEvent.CLICK[/COLOR], next3a);
[COLOR=Blue]function[/COLOR] next3a(myevent:[COLOR=Blue]MouseEvent[/COLOR]):[COLOR=Blue]void [/COLOR]{
    [COLOR=Blue]var[/COLOR] myURL:[COLOR=Blue]URLRequest[/COLOR]=[COLOR=Blue]new URLRequest[/COLOR]([COLOR=DarkGreen]"page4.swf"[/COLOR]);
    myLoader[COLOR=Blue].load[/COLOR](myURL);
    [COLOR=Blue]addChild[/COLOR](myLoader);
/*Clicking on next_btn triggers the loading of the 
next .swf file. ([COLOR=DarkOrange]This is where the problem occurs[/COLOR])*/
}

back_btn.[COLOR=Blue]addEventListener[/COLOR]([COLOR=Blue]MouseEvent.CLICK[/COLOR], back3a);
[COLOR=Blue]function[/COLOR] back3a(myevent:[COLOR=Blue]MouseEvent[/COLOR]):[COLOR=Blue]void[/COLOR] {
    [COLOR=Blue]gotoAndPlay[/COLOR]([COLOR=DarkGreen]"replay3"[/COLOR]);
//Clicking on the back_btn triggers a replay of the 1st frame.
}

myLoader.[COLOR=Blue]addEventListener[/COLOR]([COLOR=Blue]MouseEvent.CLICK[/COLOR], unloadcontent3a);
[COLOR=Blue]function[/COLOR] unloadcontent3a(myevent:[COLOR=Blue]MouseEvent[/COLOR]):[COLOR=Blue]void[/COLOR] {
    [COLOR=Blue]removeChild[/COLOR](myLoader);
}

So here it is, thanks in advance!