用脚本启动vnpy连接TTS就报错，VN Station启动VN Trader就不会

`from vnpy.event import EventEngine
from vnpy.trader.engine import MainEngine
from vnpy.trader.ui import MainWindow, create_qapp
from vnpy.gateway.ctp import CtpGateway
from vnpy.app.cta_strategy import CtaStrategyApp
from vnpy.app.cta_backtester import CtaBacktesterApp
from vnpy_datamanager import DataManagerApp
from vnpy.gateway.tts import TtsGateway

def main():
"""Start VN Trader"""
qapp = create_qapp()

event_engine = EventEngine()
main_engine = MainEngine(event_engine)

main_engine.add_gateway(CtpGateway)
main_engine.add_app(CtaStrategyApp)
main_engine.add_app(CtaBacktesterApp)
main_engine.add_app(DataManagerApp)
main_engine.add_gateway(TtsGateway)

main_window = MainWindow(main_engine, event_engine)
main_window.showMaximized()

qapp.exec()

if name == "main":
main()`

CTP接口和TTS接口不能一起连接，你把main_engine.add_gateway(CtpGateway)这行代码注释掉试试看。