Flash cs6 AS3 1119 error, undefined property READY through a reference with static type Class. What should I do?

I need help. How to I fix the problem? I use Flash CS6 and AS3. Please Help me to fix it, and thanks a lot! God bless you. Happy New Year!

Output: Symbol 'cinematography_mc', Layer 'AS3', Frame 1, Line 31 1119: Access of possibly undefined property READY through a reference with static type Class.

import fl.video.*;
import flash.events.MouseEvent;
import flash.sampler.pauseSampling;

var flvPlayer:FLVPlayback = new FLVPlayback();
addChild(flvPlayer);
flash.events.Event.MOUSE_LEAVE;
if(!stage.hasEventListener("Leave"))
{
stage.addEventListener("Leave", __onLeaveThis);
}

function __onLeaveThis(e : Event) : void
{
myVideo.stop();
 }
 //The next line assumes you have copied the skin file to the directory
 //that contains the published SWF file. If you are testing the 
 //application in Flash Professional, this is the same directory as the
 //FLA file, too.


function readyHandler(event:VideoEvent):void
{
// Pause until the video can play till the end
myVideo.pause();
myVideo.playWhenEnoughDownloaded();
}

myVideo.addEventListener(VideoEvent.READY, readyHandler);

var mybtn:Array = new      Array(Movie1_btn,Movie2_btn,Movie3_btn,Movie4_btn,Movie5_btn,Movie6_btn,Movie    7_btn,Movie8_btn,Movie9_btn);
for (var i=0; i<mybtn.length; i++)
{
mybtn[i].addEventListener(MouseEvent.CLICK,clickhandler);
function clickhandler(event:MouseEvent):void
{

    if (event.target == Movie1_btn)
    {
        myVideo.source = "1_Bad Water Sequence.mov";
    }
    else if (event.target==Movie2_btn)
    {
        myVideo.source = "2_Nat Geo Clips_Red Wolf Docu.mp4";
    }
    else if (event.target==Movie3_btn)
    {
        myVideo.source = "3_News_Anthrax_Postal Story.mov";
    }
    else if (event.target==Movie4_btn)
    {
        myVideo.source = "4_Energy Ducumentary 2 min Clip.mov";
    }
    else if (event.target==Movie5_btn)
    {
        myVideo.source = "5_Wildlife_Scenic_Reel.mov";
    }
    else if (event.target==Movie6_btn)
    {
        myVideo.source = "6_Intro Title Sequence for Mt.Rushmore    Webcasts.mov";
    }
    else if (event.target==Movie7_btn)
    {
        myVideo.source = "7_PowWow Ancestry Dream Sequence.mov";
    }
    else if (event.target==Movie8_btn)
    {
        myVideo.source = "8_Fence Fixin-Western style-L.mov";
    }
    else if (event.target==Movie9_btn)
    {
        myVideo.source = "9_Docu_3 separate Clips.mov";
        }
        myVideo.stop()
    }
 }
stop();