I have taken a look that the readme.txt file of the plugin and I suspect your case is due to the incorrect path to the mailman.
I am not sure of your hosting server setup, in a typical redhat / cpanel setup, mailman is in :-
/usr/local/cpanel/3rdparty/mailman/
if you have SSH access to the system, you can try :-
locate add_members and see what the system gives you, for example for above path, it should look like :-
/usr/local/cpanel/3rdparty/mailman/bin/add_member
Hope this helps.
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