throw new Exception("Could not get item. The system user interface is null.");
throw new Exception("Could not get item. The display is null.");
    protected Item getItem(Space p) throws Exception {        Item i = null;        Display c = (Display) getChild(Controller.SYSTEM_USER_INTERFACE);        if (c != null) {            i = c.getChild(p);        } else {            throw new Exception("Could not get item. The system user interface is null.");        }        return i;    }