@SuppressWarnings("unchecked")
    public <T> ResponseList<T> fetchPrevious(Paging<T> paging) throws FacebookException {
        ensureAuthorizationEnabled();
        URL url = paging.getPrevious();
        if (url == null) {
            return null;
        }
        return (ResponseList<T>) fetchPaging(url, paging.getJSONObjectType());
    }