Simple button error

[pokrishka]

Hi everybody,

I had some little experience in AS2 and now I'm trying to code a simple application with AS3. I have several scenes there:
Intro
Video
Question

First 2 scenes are empty for now, on the Question scene I placed stop(); on actions layer and then I created a button symbol, made it's instance name btn_play and put this code into actions layer:

stop();

btn_play.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
function mouseDownHandler(event:MouseEvent):void {
    play();
}

So when you click on the button it should continue playing. But I get an error and the button doesn't work. Here's an output:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at flash_fla::MainTimeline/frame3()

Looks like I don't have that instance there yet, but how can that be? Appreciate any help with it.

[kattehus]

Don't have btn_play in front of your addEventListener.

Edit:
Wait, I may have misunderstood what you wrote..

Is the code you posted in your stage actions layer or in your button?

[Yui]

you need to have that code on frame 3. that should work.

[pokrishka]

I'll try to explain. I have 3 scenes each of them having 1 frame. First two scenes are empty for now, so it passes right onto scene 3 called "Question". There I have 2 layers, a layer with actions and a layer with objects. On the actions layer I have the code I posted. On the objects layer I have an instance of a button called "btn_play". I want to continue playing once I click the button.

[pokrishka]

Somehow this works if I use a MovieClip instead of a Button. Well, that's fine with me

[Yui]

Originally Posted by pokrishka

Somehow this works if I use a MovieClip instead of a Button. Well, that's fine with me

It sounds like you deleted the folders required for the button from the library. When you use Flash components - when you drag them on the stage, some folders are imported in the library. Those should stay there.