code: public void deliverError(JusError error) {
          synchronized (errorListeners) {
              for (RequestListener.ErrorListener errorListener : errorListeners) {
                  errorListener.onError(error);
              }
              errorListeners.clear();
          }
          synchronized (responseListeners) {
              responseListeners.clear();
          }
      }
docs: Delivers error message to the ErrorListener that the Request was
  initialized with.
  
  @param error Error details