Do not understand what is wrong in the code

Task of my code that movieclip on stage, changing its size - height when changing window size of browsers (player) so height movieclip = fenΩtre rowsers (player) of height.

Here's my code:

package
{
import flash.display. *;
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;

SerializableAttribute public class ZhMenu extends Sprite
{
public var menubg:MovieClip;

public void ZhMenu()
{
var menubg: = new menuGrad();
stage.scaleMode = StageScaleMode.NO_SCALE;
internship. Align = StageAlign.TOP_LEFT;
stage.addEventListener (Event.RESIZE, onResize);
this.addChild (menubg);
menuBG.x = 0;
menuBG.Width = 150;
menuBG.Height = stage.stageHeight;
}


public void onResize (event: Event): void
{
var sh: number = stage.stageHeight;
menuBG.x = 0;
menuBG.Width = 150;
menuBG.Height = SH;
}
}
}

In the number MovieClip menubg added on stage, but when I change the size of the window I have error:

TypeError: Error #1009: it is not possible to cause a property or a method by referring to the object "null."
to ZhMenu / onResize)

And menubg do not change size of course.

I don't understand what the problem is.

Plize help me if you know Action Script 3.0 better.

I don't know if this will fix the error, but in the function ZhMenu, you declare another object in mwnubg (var menubg: = new menuGrad();), which will have no scope within this function.  That you declare (public var menubg:MovieClip ;) outside is never instantiated, and is the one who tries to change your function onResize.)

As far as the error goes, go to your publication of Flash settings and select the option to enable debugging.  When you run the file again, there may be a number provided in the error message indicating which line is causing the problem.

Tags: Adobe Animate

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private var playerScorePreview:TextField;

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