Error #3003 : can't remove a file into ApplicationStorageDirectory

Question

I have coded a process on image file wich is working with adl (FlashBuilder debugger) but it never works in emulator (an Android release APK), although I adapted it correctly, I think, from an AIR plateform version. The good thing is that I can pick an image to application into the two plateforms !
Bad thing is I can't delete the file in applicationStorageDirectory on Android version.
Two questions : In first, I'm not sure to have writing and removing file permission, I seems to be ok ?
Secondly, did I use the right method to delete a file located into applicationStorageDirectory ?
I can be In first I get the physical image to fileSystem with method :
myImgFile.browseForOpen("title", [imagesFilter])
on adl. Secondary I got physical image with all the specific events of CameraRoll class, and the
myCameraRoll.browseForImage()
interactive method on my Android packaging for testing version.
protected function onAjouterFichierPhoto(event:CollectionEvent=null):void{
    var myImg:Image = new Image();
    myImg.source = event.currentTarget[0].nom; // Utilisation de acResultatFichierImg.nom
    var strImgSource:String = myImg.source.toString().substr(13);
    try{
        var myFile:File = File.applicationStorageDirectory.resolvePath(strImgSource1.substr(13));
        myFile.deleteFile();
        if(myFile.exists == false)
            trace("Fichier supprimé du storageDirectory !");
    catch(e:Error){
        trace("Photos->viewAjouterImage->Erreur #"+e.errorID+" : "+e.message+"\n");
I received error #3003 "File or directory does not exist", does anybody know the reason of this wrong return ?
NB : To be more precise, If I see the return of the variable strImgSource, I can see that : "storage:[photoName]" !

Answer 1

I'm sure that the file exists, but I don't understand the response !