Button for the next scene

I am new to Action scripts (like only a few weeks here) and I am trying to create a button that switches a user from one scene to the other.  In doing the research, this is the script that I found which so far has given me the least errors:

Stop();
function nextscene(event:MouseEvent):void {}
nextScene();
}
function prevscene(event:MouseEvent):void {}
prevScene();
}
nextbtn.addEventListener (MouseEvent.CLICK, nextscene);
prevbtn.addEventListener (MouseEvent.CLICK, prevscene);

----

The only error I get is:

Error #1009: coannot access property or method of a null object reference.

to buttontest_fla: Timeline/frame main 425()

In AS3, you can't attach code to the buttons as you can do it in AS2.  All the AS3 code must be in the timeline panel.  All instances that have code assigned to them must have instance names assigned to them... instance names are assigned in the properties panel.  If you have more than one keyframe for these buttons, then each keyframe instance must be an instance name and the code assigned to it.

Tags: Adobe Animate

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