Trouble moving externally loaded image

I'm new to AS3 and I'm having a problem moving an externally loaded image within a Class. I'm just not sure how to move the externally loaded image.  I thought of creating a Sprite and then moving an added child Sprite, to which I would then load the image.  But I'm getting this error:

1119: Access of possibly undefined property spHolder through a reference with static type flash.display:Sprite.

I commented below where the error is being triggered:

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package {

   
    import flash.display.MovieClip;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.display.Loader;
    import flash.net.URLRequest;
   
    public class SnapShot extends MovieClip {
       
        public var strLink:String;
        public var strImage:String;
        private var spPolaroid:Sprite = new Sprite();
        private var ldPhoto:Loader;
       
        function SnapShot(strImg:String,strURL:String):void {
           
                strLink = strURL;
                strImage = strImg;
               
                trace("New SnapShot");
               
                spPolaroid.graphics.beginFill(0xCCCCCC);
                spPolaroid.graphics.drawRect(0,0,120,140);
                addChild(spPolaroid);
               
                var spHolder:Sprite = new Sprite();
                spHolder.x = 10;
                spHolder.y = 10;
                spPolaroid.addChild(spHolder);
                               
                loadImage(strImage);
           
        };       
       
        private function loadImage(strUrl:String):void {
                   
            ldPhoto = new Loader();
            ldPhoto.load(new URLRequest(strUrl));
            ldPhoto.contentLoaderInfo.addEventListener(Event.COMPLETE, imageLoaded);
           
        };
               
        private function imageLoaded(evt:Event):void {
           
            spPolaroid.spHolder.addChild(ldPhoto); // Here's where the error is hitting
           
        };
       
    };   
   
};

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