UXO notebook: TypeError: object of type 'zip' has no len()

[prisae]

TDEM_UXO.ipynb

After installing cvxopt in Python 3.7, the UXO-notebook still fails with the following error:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
~/anaconda3/lib/python3.7/site-packages/ipywidgets/widgets/interaction.py in update(self, *args)
    254                     value = widget.get_interact_value()
    255                     self.kwargs[widget._kwarg] = value
--> 256                 self.result = self.f(**self.kwargs)
    257                 show_inline_matplotlib_plots()
    258                 if self.auto_display and self.result is not None:

~/anaconda3/lib/python3.7/site-packages/geoscilabs/em/UXO_TEM_Widget.py in fcnImageUXOWidget(psi, theta, phi, k1, alpha1, beta1, gamma1, k2, alpha2, beta2, gamma2, k3, alpha3, beta3, gamma3, tn)
   1507     # Orientation plot
   1508     ax1.add_collection3d(
-> 1509         Poly3DCollection(v1, facecolors="k", linewidths=0.25, edgecolors="k")
   1510     )
   1511     ax1.add_collection3d(

~/anaconda3/lib/python3.7/site-packages/mpl_toolkits/mplot3d/art3d.py in __init__(self, verts, zsort, *args, **kwargs)
    595         and _edgecolors properties.
    596         """
--> 597         super().__init__(verts, *args, **kwargs)
    598         self.set_zsort(zsort)
    599         self._codes3d = None

~/anaconda3/lib/python3.7/site-packages/matplotlib/collections.py in __init__(self, verts, sizes, closed, **kwargs)
   1044         Collection.__init__(self, **kwargs)
   1045         self.set_sizes(sizes)
-> 1046         self.set_verts(verts, closed)
   1047         self.stale = True
   1048 

~/anaconda3/lib/python3.7/site-packages/mpl_toolkits/mplot3d/art3d.py in set_verts(self, verts, closed)
    650     def set_verts(self, verts, closed=True):
    651         """Set 3D vertices."""
--> 652         self.get_vector(verts)
    653         # 2D verts will be updated at draw time
    654         PolyCollection.set_verts(self, [], False)

~/anaconda3/lib/python3.7/site-packages/mpl_toolkits/mplot3d/art3d.py in get_vector(self, segments3d)
    634         for p in segments3d:
    635             points.extend(p)
--> 636             ei = si + len(p)
    637             segis.append((si, ei))
    638             si = ei

TypeError: object of type 'zip' has no len()