ActionScript 3.0 :: Error - Stage Is Null Reference

Jul 4, 2009

from my documentclass  i got a isntance of the my view class in there i got a instance of navigation class extends Sprite I got a utilz.as file with all static public functions like this one
 
alignToCenter(obj:DisplayObject):vid
{
obj.x = obj.stage.stageWidth/2;

Utilz.alignToCenter(instance of navigation class)
 
I get a error stage is null reference..

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"...

[code]......

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