While installing or modifying mailinglist on cPanel server if you get the following error:

Bug in Mailman version 2.1.11

We're sorry, we hit a bug!
If you would like to help us identify the problem, please email a copy
of this page to the webmaster for this site with a description of what
happened. Thanks!

To get this fixed, you can execute following command :

root# chmod 02775 -R /usr/local/cpanel/3rdparty/mailman/

That’s it!

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