<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_response(proto, response):
 """Parses the content from a validator response Message. """

        try:
            content = proto()
            content.ParseFromString(response.content)
            return content
        except (DecodeError, AttributeError):
            LOGGER.error('Validator response was not parsable: %s', response)
            raise errors.ValidatorResponseInvalid()