Problem running the tutorials on windows v21.12 built version

[epernod]

Using compiled version of SOFA + SoftRobots + STLIB on the v21.12 branch
I got this error when launching several examples such as the: SoftRobots/docs/tutorials/CableGripper/details/step6.pyscn

[INFO]    [PluginManager] Loaded plugin: C:/projects/sofa-build/bin/Debug/SofaCUDA_d.dll
[INFO]    [SofaPython3] Initializing with python version 3.9.4 (tags/v3.9.4:1f2e308, Apr  6 2021, 13:40:21) [MSC v.1928 64 bit (AMD64)]
[INFO]    [SofaPython3] Registering a scene loader for [.py, .py3, .pyscn, .py3scn] files.
[INFO]    [SofaPython3] Initializing python
[INFO]    [SofaPython3] Added 'C:/projects/sofa_plugins/SoftRobots/python' to sys.path
[INFO]    [SofaPython3] SofaPython3 not found in PluginManager's map.
[INFO]    [SofaPython3] Added 'C:/projects/sofa-build/lib/python3/site-packages' to sys.path
---------------------------------------
Checking SOFA_ROOT and SOFAPYTHON3_ROOT
Warning: environment variable SOFA_ROOT is empty. Trying to guess it.
Warning: cannot guess SOFA_ROOT Loading SOFA libraries will likely fail and/or SOFA won't find its resources.
---------------------------------------
[INFO]    [PluginManager] Loaded plugin: C:/projects/sofa-build/bin/Debug/SofaPython3_d.dll
[INFO]    [PluginManager] Loaded plugin: C:/projects/sofa-build/external_directories/sofa_plugins/SoftRobots/bin/Release/SoftRobots.dll
Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing.
The constructor with a QGLFormat is deprecated, use the regular contructor instead.

[ERROR]   [SofaPython3::SceneLoader] Unable to completely load the scene from file 'sofa_plugins/SoftRobots/docs/tutorials/CableGripper/details/step6.pyscn'.
Python exception:
  AttributeError: 'NoneType' object has no attribute 'loader'

At:
  <frozen importlib._bootstrap>(562): module_from_spec
  <string>(4): <module>

[alxbilger]

May be related to #142 and SofaDefrost/STLIB#79

[damienmarchal]

I'm not sure SoftRobots was updated for STLIB in the 21.12 branch.

[epernod]

there is a branch 21.12: https://github.com/SofaDefrost/STLIB/tree/release-v21.12
maybe not totally up to date?

[EulalieCoevoet]

This problem is fixed in v22.06