Error message from https://mne.tools/stable/auto_examples/preprocessing/plot_run_ica.html

errormsg.py

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/Users/john/.conda/envs/mneredux/lib/python3.7/site-packages/mne/preprocessing/ica.py", line 1633, in plot_properties
    figsize=figsize, show=show, reject=reject)
  File "/Users/john/.conda/envs/mneredux/lib/python3.7/site-packages/mne/viz/ica.py", line 472, in plot_ica_properties
    plt_show(show)
  File "/Users/john/.conda/envs/mneredux/lib/python3.7/site-packages/mne/viz/utils.py", line 110, in plt_show
    (fig or plt).show(**kwargs)
  File "/Users/john/.conda/envs/mneredux/lib/python3.7/site-packages/matplotlib/pyplot.py", line 272, in show
    return _show(*args, **kw)
  File "/Applications/PyCharm with Anaconda plugin .app/Contents/plugins/python/helpers/pycharm_matplotlib_backend/backend_interagg.py", line 27, in __call__
    manager.show(**kwargs)
  File "/Applications/PyCharm with Anaconda plugin .app/Contents/plugins/python/helpers/pycharm_matplotlib_backend/backend_interagg.py", line 99, in show
    self.canvas.show()
  File "/Applications/PyCharm with Anaconda plugin .app/Contents/plugins/python/helpers/pycharm_matplotlib_backend/backend_interagg.py", line 64, in show
    self.figure.tight_layout()
  File "/Users/john/.conda/envs/mneredux/lib/python3.7/site-packages/matplotlib/cbook/deprecation.py", line 358, in wrapper
    return func(*args, **kwargs)
  File "/Users/john/.conda/envs/mneredux/lib/python3.7/site-packages/matplotlib/figure.py", line 2482, in tight_layout
    subplotspec_list = get_subplotspec_list(self.axes)
  File "/Users/john/.conda/envs/mneredux/lib/python3.7/site-packages/matplotlib/tight_layout.py", line 249, in get_subplotspec_list
    subplotspec = subplotspec.get_topmost_subplotspec()
AttributeError: 'NoneType' object has no attribute 'get_topmost_subplotspec'