GNN Example: software problem

The example Signal Classification using Dynamic Graph Convolutions can not be executed currently.
The problem is:

10/02/2022, 12:11:42: 
executing "pygpu 'spherical_arrival_directions.py'"
--------------------
OUTPUT:

Require GPUs: 1
Require Memory: 8000
Require CPUs: 1
CondorID: 998556
Executing on slot1_2@vispa-gpu10.physik.rwth-aachen.de
/software/python/lib/python3.8/site-packages/astrotools/skymap.py:73: MatplotlibDeprecationWarning: The 'cmap' parameter to Colorbar has no effect because it is overridden by the mappable; it is deprecated since 3.3 and will be removed two minor releases later.
  cbar = plt.colorbar(events, orientation='horizontal', shrink=0.85, pad=0.05, aspect=30,
Traceback (most recent call last):
  File "spherical_arrival_directions.py", line 25, in <module>
    skymap.eventmap(example_map[:, 0:3].T, c=example_map[:, 3], cblabel="Energy (normed)", opath="skymap_%i.png" % test_id)
  File "/software/python/lib/python3.8/site-packages/astrotools/skymap.py", line 334, in eventmap
    return scatter(v, **kwargs)
  File "/software/python/lib/python3.8/site-packages/astrotools/skymap.py", line 76, in scatter
    cbar.set_clim(vmin, vmax)
AttributeError: 'Colorbar' object has no attribute 'set_clim'
done.    resource usage:  7s runtime  0% CPU  0/8000MB RAM