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ModuleNotFoundError on Binder

When I am trying to run examples on binder, in most of the notebooks there is a ModuleNotFoundError. This is e.g. the output from running first_example.ipynb:

# load Netgen/NGSolve 
from ngsolve import *
from ngsolve.webgui import Draw
from netgen.webgui import Draw as DrawGeo

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
/tmp/ipykernel_60/1097142826.py in <module>
      2 from ngsolve import *
      3 from ngsolve.webgui import Draw
----> 4 from netgen.webgui import Draw as DrawGeo

ModuleNotFoundError: No module named 'netgen.webgui'

# unit_square is the predefined domain (0,1)^2
from netgen.occ import unit_square
DrawGeo(unit_square.shape)

mesh = Mesh(unit_square.GenerateMesh(maxh=0.2))
Draw (mesh);

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
/tmp/ipykernel_60/990217587.py in <module>
      1 # unit_square is the predefined domain (0,1)^2
----> 2 from netgen.occ import unit_square
      3 DrawGeo(unit_square.shape)
      4 
      5 mesh = Mesh(unit_square.GenerateMesh(maxh=0.2))

/srv/conda/envs/notebook/lib/python3.7/site-packages/netgen/occ.py in <module>
----> 1 from .libngpy._NgOCC import *
      2 from .meshing import meshsize

ModuleNotFoundError: No module named 'netgen.libngpy._NgOCC'; 'netgen.libngpy' is not a package

The imports that cause the error were added in October last year, so maybe something has to be added to the binder configuration?

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