I have a development server that only has Mailman core installed on it. I used a virtual environment to do the installation but I did not install Postorius or Hyperkitty as I am currently working on developing a custom u.i. for Mailman 3. My programmer said the following:

"I have a problem with mailman on development server ... I was trying to add member to a list using REST api, but to no avail. After I tried all possible and impossible things, I finally looked at the logs. Error I found in log file is: IsADirectoryError: [Errno 21] Is a directory: '/opt/mailman/mm/venv/lib/python3.7/site-packages/mailman/templates' I guess mailman was looking for a template for welcome mail, and failed for some reason. I also guess this has something to do with locale or language settings I tried googling, but couldn't find anything"

The log that gave the error was /opt/mailman/mm/logs/mailman.log

My programmer tried it on another server that has both Postorius and Hyperkitty working and the api call worked, i.e. added the member to the list and sent out a welcome email. So what else do I need to install to be able to use the api to add members to a list using a non-postorius interface?

Any assistance would be appreciated.

Thanks, Brian