# Could anyone help me with setting the UILoader's source?

**URL:** <https://forum.kirupa.com/t/could-anyone-help-me-with-setting-the-uiloaders-source/266549>\
**Category:** flash\
**Created:** [July 21, 2008, 11:24pm UTC](https://forum.kirupa.com/t/could-anyone-help-me-with-setting-the-uiloaders-source/266549 "2008-07-21T23:24:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![samsilla](https://avatars.discourse-cdn.com/v4/letter/s/97f17d/32.png) [@samsilla](https://forum.kirupa.com/u/samsilla)\
**Post date:** [July 21, 2008, 11:24pm UTC](https://forum.kirupa.com/t/could-anyone-help-me-with-setting-the-uiloaders-source/266549/1 "2008-07-21T23:24:51Z")

</div>

Hi,

I’m trying to write a simple AS class that let’s me click a button (instance name is fader) on frame 1, which will take me to frame 2 where a UILoader component will load an external image. Eventually, I want to have several buttons that set a different source for the UILoader component (instance name is img). This is my code so far below:

```auto
package {
    

    import flash.display.MovieClip
    import flash.display.Shape
    import flash.display.SimpleButton
    import flash.events.MouseEvent
    import fl.containers.UILoader
    
    public class HelloWorld extends MovieClip {
        public function HelloWorld () {
            
            fader.addEventListener(MouseEvent.MOUSE_DOWN,transition);
            function transition(e:MouseEvent) {
                gotoAndPlay(2);
                img.source = "1.jpg";
            }
            
            
        }
        
    }
    
}

```

But whenever I compile I get this error…

```auto
TypeError: Error #1009: Cannot access a property or method of a null object reference. at MethodInfo-221()

```

Could anyone please help? 🙂