Play multiple sound files in different frames from library in flash

Question

My assessment task for college is to create a webpage of my work.  So far it runs brilliantly except for this.  I only need this to be working in like 2 days!  Help!
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Carolyns_Media_Portfolio_Scene1_fla::MainTimeline/frame5()
at flash.display::MovieClip/gotoAndStop()
Trying to be able to play sound clips from the library with the option to play and stop the sound file. Each sound has its own frame, with stop and play buttons. I can run the first sound file perfectly being able to start and stop it but when trying to play the next sound it creates the above error on output. I have dead buttons as well on the second sound.
The top buttons take you to each scene
The script runs from frame 5.
import flash.events.MouseEvent;
**buTrivia.addEventListener(MouseEvent.CLICK,clickListener7);
function clickListener7(event:MouseEvent):void {
SoundMixer.stopAll()
gotoAndStop("trivia");
buToyRA.addEventListener(MouseEvent.CLICK,clickListener8);
function clickListener8(event:MouseEvent):void {
SoundMixer.stopAll()
gotoAndStop("toyminatorRA");
buCaroline.addEventListener(MouseEvent.CLICK,clickListener9);
function clickListener9(event:MouseEvent):void {
SoundMixer.stopAll()
gotoAndStop("caroline");
buServerDown.addEventListener(MouseEvent.CLICK,clickListener10);
function clickListener10(event:MouseEvent):void {
SoundMixer.stopAll()
gotoAndStop("serverdown");
This was the script I found and edited.  Only Trivia works
stop();
var triviaSound:trivia = new trivia()
var triviaChannel:SoundChannel = new SoundChannel();
buplay1.addEventListener(MouseEvent.CLICK, playSound1);
buStop1.addEventListener(MouseEvent.CLICK, stopSound1)
function playSound1(event:MouseEvent):void
triviaSound.play();
function stopSound1(event:MouseEvent):void
SoundMixer.stopAll()
gotoAndStop("trivia");
/*buplay2.addEventListener(MouseEvent.CLICK, playSound2);
bustop2.addEventListener(MouseEvent.CLICK, stopSound2)
var toysSound:toys = new toys();
var toysChannel:SoundChannel = new SoundChannel();
function playSound2(event:MouseEvent):void
toysSound.play();
function stopSound2(event:MouseEvent):void
SoundMixer.stopAll()
gotoAndStop("toyminatorRA");
Basically I want to play all the sounds, from the library, individually in different frames using the option to play and stop that sound.  I found the above script but only works for one sound.  I am new at scripting in flash so any help or even a better script option would be awesome.  Thank you

Answer 1

The 1009 error indicates that one of the objects being targeted by your code is out of scope.  This could mean that the object....
- is declared but not instantiated
- doesn't have an instance name (or the instance name is mispelled)
- does not exist in the frame where that code is trying to talk to it
- is animated into place but is not assigned instance names in every keyframe for it
- is one of two or more consecutive keyframes of the same objects with no name assigned in the preceding frame(s).
If you go into your Publish Settings Flash section and select the option to Permit debugging, your error message should have a line number following the frame number which will help you isolate which object is involved.