solve the problem

No handles with labels found to put in legend.

Traceback (most recent call last):
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5.py", line 508, in _draw_idle
    self.draw()
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\backends\backend_agg.py", line 388, in draw
    self.figure.draw(self.renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\figure.py", line 1709, in draw
    renderer, self, artists, self.suppressComposite)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images
    a.draw(renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\axes\_base.py", line 2647, in draw
    mimage._draw_list_compositing_images(renderer, self, artists)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images
    a.draw(renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 670, in draw
    bbox, info, descent = textobj._get_layout(renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 276, in _get_layout
    key = self.get_prop_tup(renderer=renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 831, in get_prop_tup
    x, y = self.get_unitless_position()
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 813, in get_unitless_position
    x = float(self.convert_xunits(self._x))
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 180, in convert_xunits
    return ax.xaxis.convert_units(x)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\axis.py", line 1553, in convert_units
    f'units: {x!r}') from e
matplotlib.units.ConversionError: Failed to convert value(s) to axis units: 'LiR'
Traceback (most recent call last):
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\axis.py", line 1550, in convert_units
    ret = self.converter.convert(x, self.units, self)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\category.py", line 52, in convert
    'Missing category information for StrCategoryConverter; '
ValueError: Missing category information for StrCategoryConverter; this might be caused by unintendedly mixing categorical and numeric data
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5.py", line 508, in _draw_idle
    self.draw()
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\backends\backend_agg.py", line 388, in draw
    self.figure.draw(self.renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\figure.py", line 1709, in draw
    renderer, self, artists, self.suppressComposite)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images
    a.draw(renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\axes\_base.py", line 2647, in draw
    mimage._draw_list_compositing_images(renderer, self, artists)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images
    a.draw(renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 670, in draw
    bbox, info, descent = textobj._get_layout(renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 276, in _get_layout
    key = self.get_prop_tup(renderer=renderer)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 831, in get_prop_tup
    x, y = self.get_unitless_position()
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\text.py", line 813, in get_unitless_position
    x = float(self.convert_xunits(self._x))
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\artist.py", line 180, in convert_xunits
    return ax.xaxis.convert_units(x)
  File "D:\ProgramData\Anaconda3\lib\site-packages\matplotlib\axis.py", line 1553, in convert_units
    f'units: {x!r}') from e
matplotlib.units.ConversionError: Failed to convert value(s) to axis units: 'LiR'

Error:
matplotlib.units.Conversion error: failed to convert value to axis unit: ‘LiR’

Solution:
matplotlib version is low, update the matplotlib library to version 3.3.2 or higher!

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