Trouble unloading jpeg with unload() or removeChild()

Question

Hi Everyone,
I'm working on a project that is like a jigsaw puzzle.  The use can select from a few different puzzles that have different piece arrangements.  Once the puzzle swf file is loaded, the user can select images from a gallery to place in the pieces to make a custom puzzle where the puzzle piece movie clip that was selected masks the image that was selected.
So the puzzle swf loads fine and I add it to the stage with:
addChild(puzzle);
The jpegs also load and get masked correctly.  When I add the jpeg image, I add it to the puzzle object and the addChild looks like this:
puzzle.addChild(imageJPEGLoader);
imageJPEGLoader.load(new URLRequest(imageJPEGName));
imageJPEGLoader.x = 0;
imageJPEGLoader.y = 0;
imageJPEGLoader.mask = puzzle.maskPiece1_mc;
Where imageJPEGLoader is the loader I use to get the jpeg image.
Everything works great.  However, if the user wants to change the image used, I want to remove the child (right?).
I thought this would work:
puzzle.removeChild(imageJPEGLoader);
but it doesn't.  I get the following error:
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
at flash.display::DisplayObjectContainer/removeChild()
at puzzle.fla::MainTimeline/getImage()
I think I'm obviously not understanding the parent/child relationship fully.  I thought if imageJPEGLoader was inside puzzle, that the dot syntax would get me to the object I needed.  Everything works fine in this file except for putting a new jpeg on a piece that already had a jpeg masked.
Can someone please point me in the right direction?

Answer 1

Can you show all of the relevant code as it is arranged in your file (functions, etc)?