Hi Marco,
I am running into the same problem. All my strain are different, so is not a duplication of the same file. I attached my log, but I will like to understand why the error is generated, if you have the time to explain, please.
On a different topic, BioPython removed "Bio.Alphabet" module and that create an error in the software (
https://biopython.org/wiki/Alphabet)
I personally fixed for myself simply removing line 708 and 714 from database.py, but I am sure is not the correct way to patch it.
Best regards
Davide