[MM3-users] Server error,An error occurred while processing your request. - SITE_ID

Hi,

I did the virtualenv installation on Debian trixie.

I got mailmanweb running, created a superuser, could login into https://my.site.net/admin (after resolving CSRF errors).

I created a new site (my.site.net) in Django, deleted example.com and changed SITE_ID to 0 in /etc/mailman3/settings.py .

After restarting mailman3 and mailmanweb services I get Server error,An error occurred while processing your request. when I call https://my.site.net/admin again.

Even if I change SITE_ID back to 1 there is no change.

What have I done wrong? I haven't found any solution on the internet. And, even more important, how get I get it working again?

Thank you for your help.

Flo.