Diptanshu Jamgade writes:

I did mailman info -v. This returned me with this (error)[ http://pastebin.com/wLzDQwAu], Kindly help.

In the future, when you don't have any idea what your problem is, please report as a bug at GitLab (right now GitLab is down I hear?), or attach the trace to your mail rather than using pastebin, so that it is archived and searchable. No action needed this time.

pastebin is an excellent service for on-the-fly discussions, such as draft patches, but by design it is not archival. Your report is wasted for others searching for a solution if the traceback goes away, and probably isn't very searchable at pastebin even while it's stored there.

Thanks in advance!

Steve