1021:Dublicate function definition BUT dif. def

1

Hi…
My first post so sry if wrong forum or something.
I get error 1021: Dublicate function definition in CS4 but I use different definitions. Whats wrong?
Heres my 2 buttons:

function setupEvents() {
infBTN.addEventListener(MouseEvent.CLICK, clickButton);

}
setupEvents();

function clickButton(e:MouseEvent) {
gotoAndPlay(55);
}

function setupEvents() {
contactBTN.addEventListener(MouseEvent.CLICK, clickButtonHandler2);

}
setupEvents();

function clickButtonHandler2(e:MouseEvent) {
gotoAndStop(40);
}