This reply will probably not help you, but... when I encountered a similar error, restarting the server-side Mailman services solved it, and it was a one time issue that didn't recur.
Albeit if it happens again after a restart, or even better, you find a reliable way to reproduce it, I suggest to wait for the response of the pros/devs, as I'm also a new user of Mailman 3. _______________________________________________ Mailman-users mailing list -- mailman-users@mailman3.org To unsubscribe send an email to mailman-users-le...@mailman3.org https://lists.mailman3.org/mailman3/lists/mailman-users.mailman3.org/ Archived at: https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/message/6WUFG5R7R26NVCLXLEAIG6KUXLU4TVNP/ This message sent to arch...@mail-archive.com
