Unable to publish picture to facebook from android app

I've write this code for share a screenshot of current view on user facebook account. This is how i take screenshot

private File captureScreen() {

    Bitmap screenshot = null;
    try {

        if (view != null) {

            screenshot = Bitmap.createBitmap(view.getMeasuredWidth(),
                    view.getMeasuredHeight(), Config.ARGB_8888);
            Canvas canvas = new Canvas(screenshot);
            view.draw(canvas);
            // save pics
            File cache_dir = Environment.getExternalStorageDirectory();
            Log.i("SCREEN", "cache dir:" + cache_dir);
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            screenshot.compress(Bitmap.CompressFormat.PNG, 90, bytes);
            File f = new File(cache_dir + File.separator + "screen.png");
            f.createNewFile();
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
            fo.close();
            return f;
        }

    } catch (Exception e) {
        // TODO
    }

    return null;
}

and this is how i share screenshot

BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeFile(captureScreen()
                .getAbsolutePath(), options);
        if (bitmap != null) {
            Request uploadRequest = Request.newUploadPhotoRequest(
                    Session.getActiveSession(), bitmap,
                    new Request.Callback() {
                        @Override
                        public void onCompleted(Response response) {
                            Toast.makeText(getActivity(),
                                    "Photo uploaded successfully",
                                    Toast.LENGTH_LONG).show();
                        }
                    });
            uploadRequest.executeAsync();

Now toast of success is showed, but no picture is uploaded to my facebook profile. (my app is not public yet on facebook, but i am the owner, so i can perform all actions)