ModuleNotFoundError: No module named 'System'

[kaixin-bai]

command:

python3 ~/plotoptix/examples/1_basics/0_try_plotoptix.py

error:

Traceback (most recent call last):
  File "0_try_plotoptix.py", line 2, in <module>
    from plotoptix import TkOptiX
  File "/home/kb/anaconda3/envs/ppd/lib/python3.6/site-packages/plotoptix/__init__.py", line 24, in <module>
    from plotoptix.npoptix import NpOptiX
  File "/home/kb/anaconda3/envs/ppd/lib/python3.6/site-packages/plotoptix/npoptix.py", line 15, in <module>
    from plotoptix.geometry import GeometryMeta
  File "/home/kb/anaconda3/envs/ppd/lib/python3.6/site-packages/plotoptix/geometry.py", line 15, in <module>
    from plotoptix._load_lib import load_optix
  File "/home/kb/anaconda3/envs/ppd/lib/python3.6/site-packages/plotoptix/_load_lib.py", line 17, in <module>
    from System import IntPtr, Int64
ModuleNotFoundError: No module named 'System'

Python 3.6.13 |Anaconda, Inc.| (default, Feb 23 2021, 21:15:04) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import clr
>>> from System import String
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'System'

[robertsulej]

Could you, please, run

import clr
print(clr.__version__)

and post the output? Maybe you have a name clash with another clr module.