所以我正在使用 python 交互式经纪商 api，并且我正在尝试向交互式经纪商下限价单。我的代码是：from ibapi.client import EClientfrom ibapi.wrapper import EWrapperfrom ibapi.contract import Contractfrom ibapi.order import Orderimport threadingimport timeclass TradingApp(EWrapper, EClient, Contract, Order):    def __init__(self):        EClient.__init__(self, self)     def nextValidOrderId(self, orderId):        super().nextValidId(orderId)        self.nextValidOrderId = orderId        print("NextValidId:", orderId)def websocket_con():    app.run()            app = TradingApp()app.connect("127.0.0.1", 7497, clientId=1)con_thread = threading.Thread(target=websocket_con, daemon=True)con_thread.start()time.sleep(1)contract=Contract()contract.symbol = 'AMD'contract.secType = 'STK'contract.currency = 'USD'contract.exchange = 'SMART'order=Order()order.action = 'BUY'order.orderType = 'LMT'order.totalQuantity = 1order.lmtPrice = 10app.placeOrder(app.nextValidOrderId,contract,order)time.sleep(5) 我已确保选中“启用活动和套接字客户端”并且信任 IP 地址为 127.0.0.1 为什么我会收到此日志记录错误？