actionscript-3 - TypeError: エラー #1009: null オブジェクト参照のプロパティまたはメソッドにアクセスできません。eLearning2_fla::MainTimeline/frame205() で

Question

ユーザーが移動するセクションを選択できるメニューであるシンプルなフラッシュゲームを作成しています。動詞ボタン (verbal_btn) をクリックすると、動詞セクションに移動します。タイプエラーが発生します

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at elearning2_fla::MainTimeline/playSmall()

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at elearning2_fla::MainTimeline/verbalSmall()

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at elearning2_fla::MainTimeline/frame205()

コードがインスタンスまたはボタンの重複がない右側のフレームの下にすべての名前が付けられています。

stop(); 


physical_btn.buttonMode = true


physical_btn.addEventListener(MouseEvent.CLICK, physicalGame);
function physicalGame(event:MouseEvent): void {
gotoAndPlay(455);

}

physical_btn.addEventListener(MouseEvent.MOUSE_OVER, physicalBig);
function physicalBig(event:MouseEvent): void {
physical_btn.scaleX=1.5;
physical_btn.scaleY=1.5;
}

physical_btn.addEventListener(MouseEvent.MOUSE_OUT, physicalSmall);
function physicalSmall(event:MouseEvent): void {
physical_btn.scaleX=1;
physical_btn.scaleY=1;
}

cyber_btn.buttonMode = true

cyber_btn.addEventListener(MouseEvent.CLICK, cyberGame);
function cyberGame(event:MouseEvent): void {
gotoAndPlay(720);
}

cyber_btn.addEventListener(MouseEvent.MOUSE_OVER, cyberBig);
function cyberBig(event:MouseEvent): void {
cyber_btn.scaleX=1.5;
cyber_btn.scaleY=1.5;
}

cyber_btn.addEventListener(MouseEvent.MOUSE_OUT, cyberSmall);
function cyberSmall(event:MouseEvent): void {
cyber_btn.scaleX=1;
cyber_btn.scaleY=1;
}

verbal_btn.buttonMode = true


verbal_btn.addEventListener(MouseEvent.CLICK, verbalGame);
function verbalGame(event:MouseEvent): void {
gotoAndPlay(190);
}

verbal_btn.addEventListener(MouseEvent.MOUSE_OVER, verbalBig);
function verbalBig(event:MouseEvent): void {
verbal_btn.scaleX=1.5;
verbal_btn.scaleY=1.5;
}

verbal_btn.addEventListener(MouseEvent.MOUSE_OUT, verbalSmall);
function verbalSmall(event:MouseEvent): void {
verbal_btn.scaleX=1;
verbal_btn.scaleY=1;
}

口頭部分の枠に入ったときのコードです。機能する唯一のボタンは情報ボタン (info_btn) です。残りは、クリックしても何もしません。

var mySound5:UHOH = new UHOH();
var mySound4:DING = new DING();


info_mc.addEventListener(MouseEvent.CLICK, verbalInfo);
function verbalInfo(event:MouseEvent): void {
gotoAndPlay(452);
}

info_mc.addEventListener(MouseEvent.MOUSE_OVER, infoBig);
function infoBig(event:MouseEvent): void {
info_mc.scaleX=1.2;
info_mc.scaleY=1.2;
}

info_mc.addEventListener(MouseEvent.MOUSE_OUT, infoSmall);
function infoSmall(event:MouseEvent): void {
info_mc.scaleX=1;
info_mc.scaleY=1;
}

menu_btn.addEventListener(MouseEvent.CLICK, verbalMenu);
function verbalMenu(event:MouseEvent): void {
gotoAndPlay(180);
}

menu_btn.addEventListener(MouseEvent.MOUSE_OVER, bigMenu);
function bigMenu(event:MouseEvent): void {
menu_btn.scaleX=1.1;
menu_btn.scaleY=1.1;
}

menu_btn.addEventListener(MouseEvent.MOUSE_OUT, smallMenu);
function smallMenu(event:MouseEvent): void {
menu_btn.scaleX=1;
menu_btn.scaleY=1;
}


nasty_btn.addEventListener(MouseEvent.CLICK, verbalNasty);
function verbalNasty(event:MouseEvent): void {
mySound4.play();
gotoAndPlay(206);
}

nasty_btn.addEventListener(MouseEvent.MOUSE_OVER, nastyBig);
function nastyBig(event:MouseEvent): void {
nasty_btn.scaleX=1.2;
nasty_btn.scaleY=1.2;
}

nasty_btn.addEventListener(MouseEvent.MOUSE_OUT, nastySmall);
function nastySmall(event:MouseEvent): void {
nasty_btn.scaleX=1.1;
nasty_btn.scaleY=1.1;
}

pretty_btn.addEventListener(MouseEvent.CLICK, verbalPretty);
function verbalPretty(event:MouseEvent): void {
mySound5.play();
}

pretty_btn.addEventListener(MouseEvent.MOUSE_OVER, prettyBig);
function prettyBig(event:MouseEvent): void {
pretty_btn.scaleX=1.2;
pretty_btn.scaleY=1.2;
}

pretty_btn.addEventListener(MouseEvent.MOUSE_OUT, prettySmall);
function prettySmall(event:MouseEvent): void {
pretty_btn.scaleX=1.1;
pretty_btn.scaleY=1.1;
}

nice_btn.addEventListener(MouseEvent.CLICK, verbalNice);
function verbalNice(event:MouseEvent): void {
mySound5.play();
}

nice_btn.addEventListener(MouseEvent.MOUSE_OVER, niceBig);
function niceBig(event:MouseEvent): void {
nice_btn.scaleX=1.2;
nice_btn.scaleY=1.2;
}

nice_btn.addEventListener(MouseEvent.MOUSE_OUT, niceSmall);
function niceSmall(event:MouseEvent): void {
nice_btn.scaleX=1.1;
nice_btn.scaleY=1.1;
}

trace(nice_btn);

stop();

ファイルへのリンクはこちら

ありがとうございました