[MM3-users] Unexpexted error: if you are sure you want to run as root, specify --run-as-root"

I want to execute some commands in mailman shell. I log in terminal as super user. But when I use the command mailman shell -l my.list.id i get the responce: "error: if you are sure you want to run as root, specify --run-as-root" I tried: mailman shell -l --run-as-root my.list.id but this does not help. Thank you for all hints. Wolfgang