TypeError: Error #1009 for Tween Class

Hello, I'm trying to tween some movie clip object that I created with following code.
But I  get error like:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
      at fl.transitions::Tween/setPosition()
      at fl.transitions::Tween/set position()
      at fl.transitions::Tween()
      at main_fla::MainTimeline/frame10()
      at flash.display::MovieClip/gotoAndStop()
      at main_fla::MainTimeline/onComplete()

I checked movie_mc with trace(typeof(movie_mc)) = object.
But I'm getting the error and cannot find what the problem is.
Please someone help.
Thank you.
import fl.transitions.Tween;
import fl.transitions.easing.*;
var loadedTween:Tween = new Tween(movie_mc, "alpha", Regular.easeOut, 0, 1, 10, false);
// movie_mc movie clip contains some other movie clips

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Eaddy BarnesITCommented:

the snippet of code you provided works fine. you dont need line five for the code to run.
so could you provide a few more details as to what you were trying to do and did not succeed in doing?

your problem is in your setPosition() function. you're referencing something that doesn't exist yet.

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