Import error when called netgen.gui on Big Sur

Hello everybody,

I try to test the i-tutorial of 4.2 Constructive Solid Geometry because I want to start 3D FEM on MacOS 11.6.
But when I import netgen.gui, I face Tcl Error

TclError Traceback (most recent call last)
----> 1 import netgen.gui
2 from ngsolve import Draw, Redraw # just for visualization

/Applications/ in
16 import os
17 if not “NETGEN_DOCUMENTATION_RST_FORMAT” in os.environ:
—> 18 StartGUI()
20 def Snapshot(w,h, filename=None):

/Applications/ in StartGUI()
9‘lappend ::auto_path ’ + netgen._netgen_bin_dir)
10 # load with absolute path to avoid issues on MacOS
—> 11‘load "’+netgen._netgen_lib_dir.replace(’\‘,’/‘)+’/libgui[info sharedlibextension]" gui’)
12 netgen.libngpy._meshing._ngscript)

TclError: dlopen(/Applications/, 6): Symbol not found: OBJC_CLASS$_NSOpenGLContext
Referenced from: /Applications/
Expected in: flat namespace
in /Applications/

I believe that NSOpenGLContext is deprecated.
Can’t I use Netgen for 3D visualization through jupyter notebook or python directly?

I would appreciate it if you give me any comments.