Slide the signs animated, identical to the tutorial and works still do not

Here is the link I followed step by step with the same code to get sliding panels: http://www.Tutvid.com/Tutorials/Flash/tutorials/slideOutInfoPanels.php

All the code is made to feel how it should work, but I get

TypeError: Error #1009: cannot access a property or method of a null object reference.
at slideOutInfoPanel_fla::MainTimeline/frame1()

and here is my code as well as in the tutorial

panel_mc.panelinner_mc.popup_btn.addEventListener (MouseEvent.ROLL_OVER, rollF);

function rollF(event:MouseEvent):void {if (panel_mc.currentFrame < < 2) {panel_mc.play ();}     } else {panel_mc.gotoAndPlay (20);}     } }

I've also attached the file, it is very basic, but it's driving me crazy

Adjust you the setting to see if you can get a line number for the source of the error?

More generally, the error message means that something is out of scope of the code.  You may have called it correctly, but are the objects present in the frameworks where this code is executed?  If they live somewhere down the/a timeline, while they do not exist for this code.

And I know will say you you quadruple enabled, but you'd be surprised how many times people do not realize that they are not quadruple checking the right thing and believe has assigned instance names... and then they pass on their record for a look see and it is obvious that they did not cede.  So please don't be offended by my saying that instance names are assigned via the properties panel, they are not the library names, you give things during their creation as symbols.

Tags: Adobe Animate

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