ProFTPd is no longer part of the CWP
If you can not login to your ProFTPd server and the server is started then you need to change/comment this option in proftpd config.
This is how this need's to look in config file: /etc/proftpd.conf
# Use pam to authenticate (default) and be authoritative
#AuthPAMConfig proftpd
#AuthOrder mod_auth_pam.c* mod_auth_unix.c
Now restart ProFTPd in CWP and test login to your user account.