1046: Type was not found or was not a compile-time constant: Event.

I am more than a little frustrated.  I'm using Flash Professional CS5.5, attempting to publish ActionScript 3.0 for FlashPlayer 10.2

My code begins with:

import flash.events.MouseEvent;

import flash.events.Event;

import flash.events.KeyboardEvent;

import flash.utils.Timer;

import flash.events.TimerEvent;

Then much later I have:

teamFourCar_mc.addEventListener(Event.ENTER_FRAME, trackPosition);

function trackPosition (event:Event)

{

and I keep getting a compiler error:

I have imported the class "Events".  I have successfully used the same construction in other scripts... in fact, virtually the same construction is included in Code Snippets as Fade In and Fade Out.  Adding ":void" after (event:Event) makes no difference.  I have Googled - to no avail - and spent the better part of a day reading through the on-line help files, but the solution is still eluding me.

It's probably so simple I'm going to smack myself in the forehead and mutter "Duh!" when I find a solution...

If you can do anything to hasten that event (no pun intended) I (with the possible exception of my forehead) will be very grateful.

TIA

Terry