docs: def _check_err(data):
      """
      :param data: response json data object (must be not None).
      Check possible error code returned in the response body
      raise the coresponding exceptions
      """
      if data['d'] is None:
          raise NoDataReturned()
      if data['d']['Messages'] is None:
          return
  
      msg = data['d']['Messages']
      if len(msg) == 0 or msg[0]['Code'] is None:
          raise UnknownError()
  
      code = int(msg[0]['Code'])
      if code == 3006:
          raise CalendarNotExist()
      elif code == 3007:
          raise CalendarOwnByDiffAccount()
      else:
          logger.warn(
              "Unexpected Error Code: %s %s" % (
                  code, msg[0]['Description']))
          raise UnexpectedError()