Cannot run FlexTool on Microsoft server 12/2012

[e-zaline]

I have tried to install FlexTool in a Microsoft server 12/2012. The installation showed no error, but when running python -m spinetoolbox, I get the following error:

(flextool) C:\Users\XXXX>python -m spinetoolbox Traceback (most recent call last): File "C:\Users\XXXX.conda\envs\flextool\lib\runpy.py", line 194, in _run_module_as_main return _run_code(code, main_globals, None, File "C:\Users\XXXX.conda\envs\flextool\lib\runpy.py", line 87, in run_code exec(code, run_globals) File "C:\Users\XXXX\Spine-Toolbox\spinetoolbox_main.py", line 17, in from spinetoolbox.main import main File "C:\Users\XXXX\Spine-Toolbox\spinetoolbox\main.py", line 28, in from PySide6.QtGui import QFontDatabase ImportError: DLL load failed while importing QtGui: The specified procedure could not be found.

Do you have any idea what could be the problem?