E   nbclient.exceptions.CellExecutionError: An error occurred while executing the following cell:
E   ------------------
E   """Test the GUI widgets abstraction in notebook."""
E   from mne.viz import set_3d_backend
E   from mne.viz.backends.renderer import _get_backend
E   from mne.viz.backends.tests.test_abstract import _do_widget_tests
E   from IPython import get_ipython
E   
E   set_3d_backend('notebook')
E   backend = _get_backend()
E   
E   ipython = get_ipython()
E   ipython.magic('%matplotlib widget')
E   
E   _do_widget_tests(backend)
E   ------------------
E   
E   ---------------------------------------------------------------------------
E   TraitError                                Traceback (most recent call last)
E   Input In [1], in <cell line: 13>()
E        10 ipython = get_ipython()
E        11 ipython.magic('%matplotlib widget')
E   ---> 13 _do_widget_tests(backend)
E   
E   File ~/work/1/s/mne/viz/backends/tests/test_abstract.py:23, in _do_widget_tests(backend)
E        21 renderer.sphere([0, 0, 0], 'red', 1)
E        22 central_layout._add_widget(renderer.plotter)
E   ---> 23 canvas = backend._Canvas(5, 5, 96)
E        24 canvas.ax.plot(range(10), range(10), label='plot')
E        25 central_layout._add_widget(canvas)
E