创建简单播放器时，未知NullPointerException

NullPointerException

 try {

            player = Manager.createPlayer(\"C:\\\\Users\\\\Admin\\\\Desktop\\\\Movie_0001.3gp\");
            player.realize();
            VideoControl vc;
            vc=(VideoControl) player.getControl(\"VideoControl\");
            if(vc!=null){
                Item video=(Item) vc.initDisplayMode(vc.USE_GUI_PRIMITIVE, null);
                playerFrm=new Form(\"playing video\");
                playerFrm.append(video);
                display=display.getDisplay(this);
                display.setCurrent(playerFrm);
            }
           player.prefetch();
           player.start();

        }
        catch(IOException ex) {
            ex.printStackTrace();
        } catch (MediaException ex) {
            ex.printStackTrace();
        }