How to use the broker.Broker.Error function in broker

def __init__(self, timeout, tries):
        """Create a new empty requests set."""
        if timeout is not None and timeout < 0:
            raise Broker.Error("timeout must be non-negative or None")
        if tries is not None and tries <= 0:
            raise Broker.Error("tries must be positive or None")
        self.waiting = collections.deque()
        self.processing = collections.deque()
        self.bypath = {}
        self.timeout = timeout
        self.tries = tries

def __init__(self, timeout, tries):
        """Create a new empty requests set."""
        if timeout is not None and timeout < 0:
            raise Broker.Error("timeout must be non-negative or None")
        if tries is not None and tries <= 0:
            raise Broker.Error("tries must be positive or None")
        self.waiting = collections.deque()
        self.processing = collections.deque()
        self.bypath = {}
        self.timeout = timeout
        self.tries = tries

def get_request(self):
        """Get the first request in the queue."""
        if self.request_waiting():
            request = self.waiting.popleft()
            return self.process_request(request)
        raise Broker.Error("internal error")