Error 1120 in Flash CS3...Access of Undefined Property.

PLEASE HELP!!
I am new at Flash, but am getting the hang of it pretty quickly.
So far I've got a nice animation of an intro going, which is made up of 90 frames.
At the 90th frame I put a (stop) action...test it and it stops as it's supposed to.
I add another layer for other actions and, following code almost verbatum from a website, I declare 3 buttons, and give them functions.
Code shown below:
arch_btn.addEventListener(MouseEvent.CLICK, archPageClick);
studio_btn.addEventListener(MouseEvent.CLICK, studioPageClick);
personal_btn.addEventListener(MouseEvent.CLICK, personalPageClick);
function archPageClick(e:MouseEvent):void
    gotoAndStop("Architecture");
function studioPageClick(event:MouseEvent):void
    gotoAndStop("Studio");
function personalPageClick(event:MouseEvent):void
    gotoAndStop("Personal");
I have checked other sites for the error (1120). From what I get from them, is that my buttons are not named correctly or the Instance names do no correlate to the buttons in the actions...Well this is not correct. I have double and triple checked the instance names and they are correct. They are exactly as listed above. Here is a screen shot of my Architecture button...
As you can see the instance name of the Architecture button is "arch_btn". Same as in the action code. I don't understand why I'm getting this error!! I get it for all 3 of the buttons btw.
***ALSO...after I add this layer of actions for my buttons, the stop action on the other layer stops working. The movie play right through frame 90 now...After I delete the layer with the button actions, the stop action layer works again...Weird???
If anyone could help it would be greatly appreciated!
Thank you.
Message was edited by: mmellonphotography

When you have coding issues, files will not usually play correctly, so once you fix the coding issue it should play fine again.
Make sure you have assigned the instance names to the buttons in all keyframes, not just the ones in frame 90. If you didn't name them in frame 75, that lack of a name will be inherited in frame 90.

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