FLV player "Access of possibly undefined property" from CS6

Here's the code,

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import fl.video.*;

import caurina.transitions.Tweener;

ACMPreview_mc.mouseEnabled = false;

//ACMPlayer.load("flv/Pecan_HD.f4v");

ACMPlayer.autoRewind = true;

ACMPlayer.addEventListener(VideoEvent.PLAYING_STATE_ENTERED, ACMPreviewFadeOut);

ACMPlayer.addEventListener(VideoEvent.STOPPED_STATE_ENTERED, ACMPreviewFadeIn);

ACMPlayer.addEventListener(VideoEvent.COMPLETE, ACMPreviewFadeIn);

function ACMPreviewFadeOut(event:Event):void

{

          Tweener.addTween(ACMPreview_mc, {time:1, transition:"Linier", alpha:0});

}

function ACMPreviewFadeIn(event:Event):void

{

          Tweener.addTween(ACMPreview_mc, {time:1, transition:"Linier", alpha:1});

}

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This code is put into the movie clip which is exported as script, dynamicaly placed into the scene.

And, flv player 'ACMPlayer' is manually placed inside this movie clip.

This is just for fading in/out prepaired preview image for the player, by using tweener.