DispatchEvent help

Question

I'm just starting to learn AS3 and I'm trying to create a play button on a menu screen to start a game.
I keep getting MMenu.as,Line20 1137:Incorrect number of arguments. Expected no more than 0.
Every where I look the proper way to handle a dispatchEvent is as shown. Help is greatly appreciated.
package  {
import flash.display.MovieClip;
import flash.display.SimpleButton;
import flash.events.MouseEvent;
public class MMenu extends MovieClip {
public var PLAY:Play;
public function MMenu()
PLAY=new Play;
PLAY.x=200;
PLAY.y=300;
addChild(PLAY);
PLAY.addEventListener(MouseEvent.CLICK, go)
public function go(evt:MouseEvent):void
dispatchEvent(new dispatcher(dispatcher.GO))                                   <---Line 20

Answer 1

use:
package  {
import flash.display.MovieClip;
import flash.display.SimpleButton;
import flash.events.MouseEvent;
public class MMenu extends MovieClip {
public var PLAY:Play;
public function MMenu()
PLAY=new Play;
PLAY.x=200;
PLAY.y=300;
addChild(PLAY);
PLAY.addEventListener(MouseEvent.CLICK, go)
public function go(evt:MouseEvent):void{
dispatchEvent(new Event(dispatcher.GO)); // assuming dispatcher.GO is defined which is unlikely so use:
dispatchEvent(new Event("goEvent"));