key error in jupyter notebook using brainrender

Question

I am very new to these things thus sorry if I am not giving you enough informations about the issue !

to resume

I am trying to plot the coordinate of a group of cells in a 3D brain by using brainrender with jupyter notebook

I am using an anaconda environnement with the version 3.7.0 of python and the version of my anaconda navigator is 1.9.6.

my scirpt is working until this entry :

#Get a numpy array coordinates of some labelled cells
scene = Scene(title='area_cell') 
MOx = scene.add_brain_region("MO", alpha=0.15)
SSx = scene.add_brain_region("SS", alpha=0.15)
VISx = scene.add_brain_region("VIS", alpha=0.15)
#STRx = scene.add_brain_region("STR", alpha=0.15)

and I have this error message :

KeyError                                  Traceback (most recent call last)
~\AppData\Local\Temp\ipykernel_16228\2284008602.py in <module>
      1 #Get a numpy array coordinates of some labelled cells
----> 2 scene = Scene(title='area_cell')
      3 MOx = scene.add_brain_region("MO", alpha=0.15)
      4 SSx = scene.add_brain_region("SS", alpha=0.15)
      5 VISx = scene.add_brain_region("VIS", alpha=0.15)

~\Anaconda2\envs\plot3Dbrain\lib\site-packages\brainrender\scene.py in __init__(self, root, atlas_name, inset, title, screenshots_folder, plotter, title_color)
     48             f"Creating scene with parameters: root: {root}, atlas_name: '{atlas_name}'', inset: {inset}, screenshots_folder: {screenshots_folder}"
     49         )
---> 50         JupyterMixIn.__init__(self)
     51 
     52         self.actors = []  # stores all actors in the scene

~\Anaconda2\envs\plot3Dbrain\lib\site-packages\brainrender\_jupyter.py in __init__(self)
     10     def __init__(self):  # pragma: no cover
     11         # keep track if we are in a jupyter notebook
---> 12         if vedo.settings.notebookBackend == "k3d":
     13             self.backend = "k3d"
     14         elif vedo.settings.notebookBackend == "itkwidgets":

~\Anaconda2\envs\plot3Dbrain\lib\site-packages\vedo\utils.py in __getattr__(self, k)
    236 
    237     def __getattr__(self, k):
--> 238         return self[k]
    239 
    240     def __setattr__(self, k, v):

KeyError: 'notebookBackend'

I tried unsuccessfully to understand what was going wrong and to find someonne with the same issue, thus if you have idea it would be great !

also let me know if you need more informations,

Thanks