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Can you post a few lines of your python code up to the line causing the error to occur?

When opening a sav file by double-clicking on its name/icon, make sure it is set to use PSSe v.35 and then your python 3.9 scripts would run fine. If not, open PSSe GUI from the link provided during installation, open your case, then run your script.

When loading/running compiled code (*.pyc), make sure it was compiled with python 3.9

If you got access to the python source code, delete its pyc version.