Can't Load Downloaded Swf Files to AIR App

Hi,

I'm using MyFlashLab "Download Manager" ANE file for download SWF files to directories. (https://github.com/myflashlab/downloadManager-ANE/)

I'm creating application for Android, it will load other downloaded swf files. (Interactive Book Application, load other books when user buy)

Download Manager ANE download my swf files to "/storage/emulated/0/downloads/" directory.

But i cant load swf files to stage.

It create this error after loading: TypeError: Error #1009: Cannot access a property or method of a null object reference.

Any solution please write.

Thank you

MY CODES:

var f:File = File.documentsDirectory;

f = f.resolvePath("downloads/test.swf");

loader = new Loader();

loader.contentLoaderInfo.addEventListener(Event.COMPLETE, swfComplete);

loader.load(new URLRequest(f.url));

public function swfComplete(e:Event){

       try{

          addChild(loader);

       }catch(err:Error){

           trace(err);

       }

}