Adobe Flash Code Error Driving Me Nuts!!

Zodiacc

Can anyone tell me what I am doing wrong on this Flash tutorial?

This is the link to it
http://www.vineyardesigns.com/tutorials/flash/website/label_links.shtml

I've followed the tutorial step by step and I keep getting this error

**Error** Scene=Scene 1, layer=Buttons, frame=1:Line 2: The class or interface 'MouseEvent' could not be loaded.
function clickHome(event:MouseEvent):void

Total ActionScript Errors: 1 Reported Errors: 1

This is my code as per the tutorial:

Home.addEventListener (MouseEvent.CLICK, clickHome);
function clickHome(event:MouseEvent):void
{
trace ("home");
gotoAndStop("Home");
}
I cant figure out why MouseEvent cannot be loaded.
Can you help?

Thanks

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