TypeError: unhashable type: 'ListedColormap'

There seems to be a bug related to the matplotlib listed colormaps. I tried running your tutorial on regions and parcellations and the plotting cell threw this error:
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
[/Users/VictoriaShevchenko/Downloads/plot_tutorial_06.ipynb](https://file+.vscode-resource.vscode-cdn.net/Users/VictoriaShevchenko/Downloads/plot_tutorial_06.ipynb) Cell 12 line 5
      [2](vscode-notebook-cell:/Users/VictoriaShevchenko/Downloads/plot_tutorial_06.ipynb#X13sZmlsZQ%3D%3D?line=1) p.add_layer(regions, cmap=cmap, cbar=False)
      [3](vscode-notebook-cell:/Users/VictoriaShevchenko/Downloads/plot_tutorial_06.ipynb#X13sZmlsZQ%3D%3D?line=2) p.add_layer(regions, cmap='gray', as_outline=True, cbar=False)
----> [5](vscode-notebook-cell:/Users/VictoriaShevchenko/Downloads/plot_tutorial_06.ipynb#X13sZmlsZQ%3D%3D?line=4) fig = p.build()
      [6](vscode-notebook-cell:/Users/VictoriaShevchenko/Downloads/plot_tutorial_06.ipynb#X13sZmlsZQ%3D%3D?line=5) fig.show()

File [~/.local/lib/python3.9/site-packages/surfplot/plotting.py:498](https://file+.vscode-resource.vscode-cdn.net/Users/VictoriaShevchenko/Downloads/~/.local/lib/python3.9/site-packages/surfplot/plotting.py:498), in Plot.build(self, figsize, colorbar, cbar_kws, scale)
    475 def build(self, figsize=None, colorbar=True, cbar_kws=None, scale=(2, 2)):
    476     """Build matplotlib figure of surface plot
    477 
    478     Parameters
   (...)
    496         Surface plot figure
    497     """
--> 498     p = self.render()
    499     p._check_offscreen()
    500     x = p.to_numpy(transparent_bg=True, scale=scale)

File [~/.local/lib/python3.9/site-packages/surfplot/plotting.py:391](https://file+.vscode-resource.vscode-cdn.net/Users/VictoriaShevchenko/Downloads/~/.local/lib/python3.9/site-packages/surfplot/plotting.py:391), in Plot.render(self, offscreen)
    388     cmap = [cmaps]
    389     color_range = [crange]
--> 391 return plot_surf(surfs=self.surfaces, layout=hemi_layout,
    392                  array_name=names, cmap=cmap, color_bar=False,
    393                  color_range=color_range, view=view_layout,
    394                  background=self.background, zoom=self.zoom,
    395                  nan_color=(0, 0, 0, 0), share=True,
    396                  label_text=self.label_text, size=self.size, 
    397                  return_plotter=True, offscreen=offscreen)

File [~/.local/lib/python3.9/site-packages/surfplot/surf.py:431](https://file+.vscode-resource.vscode-cdn.net/Users/VictoriaShevchenko/Downloads/~/.local/lib/python3.9/site-packages/surfplot/surf.py:431), in plot_surf(surfs, layout, array_name, view, color_bar, color_range, share, label_text, cmap, nan_color, zoom, background, size, embed_nb, interactive, scale, transparent_bg, screenshot, filename, return_plotter, **kwargs)
    428 if screenshot or embed_nb:
    429     kwargs.update({'offscreen': True})
--> 431 p = build_plotter(surfs, layout, array_name=array_name, view=view,
    432                   color_bar=color_bar, color_range=color_range,
    433                   share=share, label_text=label_text, cmap=cmap,
    434                   nan_color=nan_color, zoom=zoom, background=background,
    435                   size=size, **kwargs)
    436 if return_plotter:
    437     return p

File [~/.local/lib/python3.9/site-packages/surfplot/surf.py:286](https://file+.vscode-resource.vscode-cdn.net/Users/VictoriaShevchenko/Downloads/~/.local/lib/python3.9/site-packages/surfplot/surf.py:286), in build_plotter(surfs, layout, array_name, view, color_bar, color_range, share, label_text, cmap, nan_color, zoom, background, size, **kwargs)
    284 cm = cmap[i, j][ia]
    285 if cm is not None:
--> 286     if cm in colormaps:
    287         table = colormaps[cm]
    288     else:

TypeError: unhashable type: 'ListedColormap'
Any insight about the possible source of the problem?
danjgale / surfplot

TypeError: unhashable type: 'ListedColormap' #29
