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I had the same problem and I've just solved it. This was my code:

import sys
import os

import xlwings as xw

import psse34
import psspy
import redirect

I changed to:

import sys
import os

import psse34
import psspy
import redirect

import xlwings as xw

I don't know why, but if I import psse34 first the problem disappears. I hope it can help others.