[MM3-users] After server upgrade debian 11→12 and reinstalling everything in (venv), I got this error when accessing → mailman3/lists

Aug. 16, 2025


      File "/opt/mailman/venv/lib/python3.11/site-packages/mailmanclient/restbase/connection.py", line 160, in call
raise HTTPError(params.get('url'), response.status_code,
urllib.error.HTTPError: HTTP Error 500: {"title": "500 Internal Server Error"}
ERROR 2025-08-16 19:26:03,720 6588 django.request Internal Server Error: /mailman3/lists/mylist.myserver.tld
Can anyone help? Other things do work, including archives, users, domains etc.

[MM3-users] After server upgrade debian 11→12 and reinstalling everything in (venv), I got this error when accessing → mailman3/lists

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