How to use the pytradfri.error.ServerError function in pytradfri

_LOGGER.debug('Received: %s', output)

    if not output:
        return None

    elif 'decrypt_verify' in output:
        raise RequestError(
            'Please compile coap-client without debug output. See '
            'instructions at '
            'https://github.com/ggravlingen/pytradfri#installation')

    elif output.startswith(CLIENT_ERROR_PREFIX):
        raise ClientError(output)

    elif output.startswith(SERVER_ERROR_PREFIX):
        raise ServerError(output)

    elif not parse_json:
        return output

    return json.loads(output)

def _process_output(res, parse_json=True):
    """Process output."""
    res_payload = res.payload.decode('utf-8')
    output = res_payload.strip()

    _LOGGER.debug('Status: %s, Received: %s', res.code, output)

    if not output:
        return None

    if not res.code.is_successful():
        if 128 <= res.code < 160:
            raise ClientError(output)
        elif 160 <= res.code < 192:
            raise ServerError(output)

    if not parse_json:
        return output

    return json.loads(output)

"""Perform the request, get the response."""
        try:
            protocol = await self._get_protocol()
            pr = protocol.request(msg)
            r = await pr.response
            return pr, r
        except ConstructionRenderableError as e:
            raise ClientError("There was an error with the request.", e)
        except RequestTimedOut as e:
            await self._reset_protocol(e)
            raise RequestTimeout('Request timed out.', e)
        except (OSError, socket.gaierror, Error) as e:
            # aiocoap sometimes raises an OSError/socket.gaierror too.
            # aiocoap issue #124
            await self._reset_protocol(e)
            raise ServerError("There was an error with the request.", e)
        except asyncio.CancelledError as e:
            await self._reset_protocol(e)
            raise e