def cmd_SERVER_ERROR(self, errText):
        """
        An error has happened server-side.
        """
        errText = repr(errText)
        log.err("Server error: " + errText)
        cmd = self._current.popleft()
        cmd.fail(ServerError(errText))

        An error has happened server-side.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/protocols/memcache.py