Python 504未连接IB API TWS错误—即使API连接显示已接受''

我已经多次try 编写IB API代码，这些代码都在生成-1 504 Not Connected error.即使代码直接和准确地来自IBKR学院的培训视频(我已经粘贴在下面).我一遍又一遍地判断了全局设置Enable ActiveX & Socket，Socket Port#是7497，客户端ID与API代码匹配，选中了Allow Connections from Localhost，在Trusted IP中输入‘127.0.0.1’和Localhost:5000

TWS中的Data Connections表显示侦听7497 Peer—to—Peer Port 127.0.1.60104 Client ID 1的API连接为Accepted；这表明API已连接.然而，当我 Select Run时，什么都没有发生—我只是在VS Code Python终端中得到了文件链接的打印，当我执行Run Python Rugger时—我收到以下消息:

PS C:\TWS API\source\pythonclient\ibapi>  & 'c:\Users\JV\AppData\Local\Programs\Python\Python312\python.exe' 'c:\Users\JV\.vscode\extensions\ms-python.debugpy-2024.2.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher' '60548' '--' 'c:\TWS API\source\pythonclient\tests\TestApp.py'

ERROR -1 504 Not connected

PS C:\TWS API\source\pythonclient\ibapi> 

我在这个论坛和其他论坛上搜索和寻找答案.有人可以帮助这个新手谁似乎是被牵制和挣扎摆脱一垒与IB API？谢谢

from ibapi.client import *
from ibapi.wrapper import *
import time

class TestApp(EClient, EWrapper):

    def __init__(self):
        EClient.__init__(self, self)

    def contractDetails(self, reqId, contractDetails):
        print(f"contract details: {contractDetails}")

    def contractDetailsEnd(self, reqId):
        print("End of contractDetails")
        self.disconnect()

def main():
    app = TestApp()

    app.connect("127.0.0.1", 7497, 1)

    mycontract = Contract()
    mycontract.symbol = "AAPL"
    mycontract.secType = "STK"
    mycontract.exchange = "SMART"
    mycontract.currency = "USD"
    mycontract.primaryExchange = "ISLAND"

    time.sleep(3)

    app.reqContractDetails(1, mycontract)

    app.run

if __name__ == "__main__":
    main()