Can not find message descriptor by type_url: (param0).

Raise code

""" "Creates a message from a type URL."""
  db = symbol_database.Default()
  pool = db.pool if descriptor_pool is None else descriptor_pool
  type_name = type_url.split('/')[-1]
  try:
    message_descriptor = pool.FindMessageTypeByName(type_name)
  except KeyError:
    raise TypeError(
        'Can not find message descriptor by type_url: {0}.'.format(type_url))
  message_class = db.GetPrototype(message_descriptor)
  return message_class()


def Parse(text, message, ignore_unknown_fields=False, descriptor_pool=None):
  """Parses a JSON representation of a protocol message into a message.

  A """