Hi Samuel, the Postorius version you use shouldn't produce that error. So here are some questions to help us find out where the problem is: - How did you install the packages (Using pip? Downloading the tarballs from launchpad? Branching the repos with bzr? Using the mailman-bundler?) - Did you make any updates in between? If so, did you restart the server after updating? - Have you installed the packages in a virtualenv? If so, is that virtualenv active? Florian -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to Postorius. https://bugs.launchpad.net/bugs/1429086 Title: Key error in mailman settings page To manage notifications about this bug go to: https://bugs.launchpad.net/postorius/+bug/1429086/+subscriptions