在退出 VN Trader 时出错：

Traceback (most recent call last):
  File "d:\vnstudio\lib\site-packages\vnpy\trader\ui\mainwindow.py", line 269, in closeEvent
    self.main_engine.close()
  File "d:\vnstudio\lib\site-packages\vnpy\trader\engine.py", line 232, in close
    gateway.close()
  File "d:\vnstudio\lib\site-packages\vnpy\gateway\oes\oes_gateway.py", line 223, in close
    self.md_api.exit()
RuntimeError: invalid argument: invalid argument

请问这是什么原因所致？该怎么办？

可以去github开个issue

xiaohe wrote:

可以去github开个issue
好的