TypeError: OnExit() takes exactly 2 arguments (1 given)

hi

why I got this error while exiting the program!?
wxPython does not send event to event handler?

EVT_MENU(self.frame, XRCID("ExitMI"), self.OnExit)
def OnExit(self, event): self.frame.Close(True)

may be I have to use EVT_EXIT?

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WBR, sector119