Error #1009

fairly new to flash however at work i have this task to create an interactive screen like a gameboy for example.

by only clicking left right and select i want to be able to continuously scroll through the highleighted options then press select on one option which will then take me to another screen.

How i have gone about this is create the options on each keyframe and the left and right button highlight each option.

I have made a new scene which when i press select it takes me to. that works fine however…

The problem is i can go to the new scene i just cannot go to another… i have the same code with changed ClickHandler names but it doesnt want to work.

these are the errors im getting.

[COLOR=#FF0000]TypeError: Error #1009: Cannot access a property or method of a null object reference.
at interactive_godgun_fla::MainTimeline/frame27()
at flash.display::MovieClip/gotoAndStop()
at interactive_godgun_fla::MainTimeline/btn_selectClickHandler2212()
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at interactive_godgun_fla::MainTimeline/frame27()
at flash.display::MovieClip/gotoAndStop()
at interactive_godgun_fla::MainTimeline/btn_leftClickHandler_hit_back()
[/COLOR][COLOR=#0000FF]

[/COLOR]
my code for each frome looks like this.

[COLOR=#0000FF]stop();[/COLOR]
[COLOR=#0000FF]btn_left.addEventListener(“click”, btn_leftClickHandler4);
function btn_leftClickHandler4(event)
{
gotoAndStop(3);
}[/COLOR]
[COLOR=#0000FF]btn_right.addEventListener(“click”, btn_rightClickHandler4);
function btn_rightClickHandler4(event)
{
gotoAndStop(5);
}
btn_select.addEventListener(“click”, btn_selectClickHandler2212);
function btn_selectClickHandler2212(event)
{
gotoAndStop(1, “field”);
}[/COLOR]
[COLOR=#0000FF]
[/COLOR][COLOR=#000000]
i can scroll through the menu options but i can only go back 1 option and wont move on from there.

Any advice critiq is welcomed. thanks[/COLOR]