AttributeError: 'VispyWidget' object has no attribute 'on_msg'

[yileichen123]

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AttributeError Traceback (most recent call last) in () ----> 1 c.show() 2 app.run();

f:\anaconda3\vispy-master\vispy\app\canvas.py in show(self, visible, run) 427 Run the backend event loop. 428 """ --> 429 self._backend._vispy_set_visible(visible) 430 if run: 431 self.app.run()

f:\anaconda3\vispy-master\vispy\app\backends_ipynb_webgl.py in _vispy_set_visible(self, visible) 206 return 207 if self._widget is None: --> 208 self._widget = VispyWidget() 209 self._widget.set_canvas(self._vispy_canvas) 210 display(self._widget)

f:\anaconda3\vispy-master\vispy\app\backends\ipython_widget.py in init(self, **kwargs) 60 def init(self, **kwargs): 61 super(VispyWidget, self).init(**kwargs) ---> 62 self.on_msg(self.events_received) 63 self.canvas = None 64 self.canvas_backend = None

AttributeError: 'VispyWidget' object has no attribute 'on_msg'