widget error

widget_error.py

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
~\.conda\envs\py5\lib\site-packages\matplotlib\backend_bases.py in _wait_cursor_for_draw_cm(self)
   2772             try:
-> 2773                 self.set_cursor(cursors.WAIT)
   2774                 yield

~\.conda\envs\py5\lib\site-packages\matplotlib\backends\backend_webagg_core.py in set_cursor(self, cursor)
    380         if cursor != self.cursor:
--> 381             self.canvas.send_event("cursor", cursor=cursor)
    382         self.cursor = cursor

~\.conda\envs\py5\lib\site-packages\matplotlib\backends\backend_webagg_core.py in send_event(self, event_type, **kwargs)
    345     def send_event(self, event_type, **kwargs):
--> 346         self.manager._send_event(event_type, **kwargs)
    347 

AttributeError: 'NoneType' object has no attribute '_send_event'

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
~\.conda\envs\py5\lib\site-packages\IPython\core\formatters.py in __call__(self, obj)
    339                 pass
    340             else:
--> 341                 return printer(obj)
    342             # Finally look for special method names
    343             method = get_real_method(obj, self.print_method)

~\.conda\envs\py5\lib\site-packages\IPython\core\pylabtools.py in <lambda>(fig)
    246 
    247     if 'png' in formats:
--> 248         png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))
    249     if 'retina' in formats or 'png2x' in formats:
    250         png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))

~\.conda\envs\py5\lib\site-packages\IPython\core\pylabtools.py in print_figure(fig, fmt, bbox_inches, **kwargs)
    130         FigureCanvasBase(fig)
    131 
--> 132     fig.canvas.print_figure(bytes_io, **kw)
    133     data = bytes_io.getvalue()
    134     if fmt == 'svg':

~\.conda\envs\py5\lib\site-packages\matplotlib\backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, **kwargs)
   2061             if bbox_inches:
   2062                 if bbox_inches == "tight":
-> 2063                     renderer = _get_renderer(
   2064                         self.figure,
   2065                         functools.partial(

~\.conda\envs\py5\lib\site-packages\matplotlib\backend_bases.py in _get_renderer(figure, print_method)
   1532     with cbook._setattr_cm(figure, draw=_draw):
   1533         try:
-> 1534             print_method(io.BytesIO())
   1535         except Done as exc:
   1536             figure._cachedRenderer, = exc.args

~\.conda\envs\py5\lib\site-packages\matplotlib\backends\backend_agg.py in print_png(self, filename_or_obj, metadata, pil_kwargs, *args, **kwargs)
    512         }
    513 
--> 514         FigureCanvasAgg.draw(self)
    515         if pil_kwargs is not None:
    516             from PIL import Image

~\.conda\envs\py5\lib\site-packages\matplotlib\backends\backend_agg.py in draw(self)
    388         self.renderer = self.get_renderer(cleared=True)
    389         # Acquire a lock on the shared font cache.
--> 390         with RendererAgg.lock, \
    391              (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar
    392               else nullcontext()):

~\.conda\envs\py5\lib\contextlib.py in __enter__(self)
    111         del self.args, self.kwds, self.func
    112         try:
--> 113             return next(self.gen)
    114         except StopIteration:
    115             raise RuntimeError("generator didn't yield") from None

~\.conda\envs\py5\lib\site-packages\matplotlib\backend_bases.py in _wait_cursor_for_draw_cm(self)
   2774                 yield
   2775             finally:
-> 2776                 self.set_cursor(self._lastCursor)
   2777         else:
   2778             yield

~\.conda\envs\py5\lib\site-packages\matplotlib\backends\backend_webagg_core.py in set_cursor(self, cursor)
    379     def set_cursor(self, cursor):
    380         if cursor != self.cursor:
--> 381             self.canvas.send_event("cursor", cursor=cursor)
    382         self.cursor = cursor
    383 

~\.conda\envs\py5\lib\site-packages\matplotlib\backends\backend_webagg_core.py in send_event(self, event_type, **kwargs)
    344 
    345     def send_event(self, event_type, **kwargs):
--> 346         self.manager._send_event(event_type, **kwargs)
    347 
    348 

AttributeError: 'NoneType' object has no attribute '_send_event'