Export of alioth mailing list archive not working
due to the deprecation of Alioth I now want to ask for a replacement of firstname.lastname@example.org on lists.debian.org. I would like the archive to be imported and followed the instructions on  to export the mbox file, but it didn't work:
thansen@moszumanska:~$ sudo /usr/local/bin/export-list debian-science-sagemath > output.tar.gz
Mailbox (/var/lib/mailman/archives/public//debian-science-sagemath.mbox/debian-science-sagemath.mbox) not found or empty - continuing anyway (trying to export subscribers)
I got a file containing the list of subscribers. Does anybody know how to do it? Am I missing permissions?