Filereference 'save' throws error

Question

i have a code which saves a display object locally as an image file, but at some point it began throwing error 2174 (up until then it worked fine). 
this code is called either from a context-menu click event or a keyboard event.
    var sourceBmd:BitmapData = new BitmapData(displayObject.width,displayObject.height);           
    sourceBmd.draw(displayObject,new Matrix(displayObject.width,0,0,displayObject.height));
    var jpgEncoder:JPGEncoder = new JPGEncoder(80);
    var byteArray:ByteArray = jpgEncoder.encode(sourceBmd);
    try
        filereference.save(byteArray,"posterImage.jpg");   
    catch (e:Error)
        Debugging.alert("error: ",e.message);           
as you can see, the filereference has only a single action - so no reason for error 2174 to be thrown (and yes - i also have a listener for the 'cancel' event).
in case you wonder - i'm publishing for flash player 10.0
any ideas?
cheers,
eRez   

Answer 1

from file reference docs
Note that because of new functionality added to the Flash Player, when publishing to Flash Player 10, you can have only one of the following operations active at one time:FileReference.browse(), FileReference.upload(), FileReference.download(), FileReference.load(), FileReference.save(). Otherwise, Flash Player throws a runtime error (code 2174). Use FileReference.cancel() to stop an operation in progress. This restriction applies only to Flash Player 10. Previous versions of Flash Player are unaffected by this restriction on simultaneous multiple operations.
I know you said you are publishing it with Flash Player 10 but what version of flash player are you running it in (not necessarily the same you are publishing it with? are you running it in the standalone or browser plugin?
FileReference was added in flash player 9 while FileReference.save() wasn't added until Flash Player 10
http://helpx.adobe.com/flash-player/kb/find-version-flash-player.html
if you are certain all of the above is ok then what happens if you add
fileReference.cancel(); above your filereference.save()
Another thought, so you have the saved jpg open in another application?