Ftp – ProFTPd won’t start – proftpd.serviceJob for proftpd.service failed

I'm done – I don't get ProFTPd to start… I tried everything. If I start proftpd with

/etc/init.d/proftpd start

I get the following:

[….] Starting proftpd (via systemctl): proftpd.serviceJob for
proftpd.service failed. See 'systemctl status proftpd.service' and
'journalctl -xn' for details. failed!

Output of "systemctl status proftpd.service":

● proftpd.service – LSB: Starts ProFTPD daemon Loaded: loaded
(/etc/init.d/proftpd) Active: failed (Result: exit-code) since Fri
2016-09-09 17:54:42 CEST; 18s ago Process: 2781
ExecStart=/etc/init.d/proftpd start (code=exited, status=1/FAILURE)

Sep 09 17:54:42 root.MYDOMAIN.de proftpd[2781]: Starting ftp server:
proftpd2016-09-09 17:54:42,110 root.MYDOMAIN.de proftpd[2787]:
warning: handling possibly truncated confi…roftpd.conf' Sep 09
17:54:42 root.MYDOMAIN.de proftpd[2781]: 2016-09-09 17:54:42,113
root.MYDOMAIN.de proftpd[2787]: warning: unable to determine IP
address of 'root.MYDOMAIN.de' Sep 09 17:54:42 root.MYDOMAIN.de
proftpd[2781]: 2016-09-09 17:54:42,114 root.MYDOMAIN.de proftpd[2787]:
error: no valid servers configured Sep 09 17:54:42 root.MYDOMAIN.de
proftpd[2781]: 2016-09-09 17:54:42,114 root.MYDOMAIN.de proftpd[2787]:
fatal: error processing configuration file '/etc/proftpd/proftpd.conf'
Sep 09 17:54:42 root.MYDOMAIN.de proftpd[2781]: failed! Sep 09
17:54:42 root.MYDOMAIN.de systemd[1]: proftpd.service: control process
exited, code=exited status=1 Sep 09 17:54:42 root.MYDOMAIN.de
systemd[1]: Failed to start LSB: Starts ProFTPD daemon. Sep 09
17:54:42 root.MYDOMAIN.de systemd[1]: Unit proftpd.service entered
failed state. Hint: Some lines were ellipsized, use -l to show in
full.

journal output:

— Logs begin at Thu 2016-09-08 14:58:07 CEST, end at Fri 2016-09-09 17:58:10 CEST. — Sep 09 17:58:01 root.MYDMOMAIN.de CRON[2892]: (root)
CMD (/home/ts/statuscheck.sh >/dev/null 2>&1) Sep 09 17:58:01
root.MYDMOMAIN.de CRON[2891]: pam_unix(cron:session): session closed
for user root Sep 09 17:58:10 root.MYDMOMAIN.de proftpd[2912]: Starting
ftp server: proftpd2016-09-09 17:58:10,195 root.MYDMOMAIN.de
proftpd[2918]: warning: handling possibly truncated configuration data
a t line 188 of '/etc/proftpd/proftpd.conf' Sep 09 17:58:10
root.MYDMOMAIN.de proftpd[2912]: 2016-09-09 17:58:10,201
root.MYDMOMAIN.de proftpd[2918]: warning: unable to determine IP
address of 'root.MYDMOMAIN.de' Sep 09 17:58:10 root.MYDMOMAIN.de
proftpd[2912]: 2016-09-09 17:58:10,202 root.MYDMOMAIN.de proftpd[2918]:
error: no valid servers configured Sep 09 17:58:10 root.MYDMOMAIN.de
proftpd[2912]: 2016-09-09 17:58:10,202 root.MYDMOMAIN.de proftpd[2918]:
fatal: error processing configuration file '/etc/proftpd/proftpd.conf'
Sep 09 17:58:10 root.MYDMOMAIN.de proftpd[2912]: failed! Sep 09
17:58:10 root.MYDMOMAIN.de systemd[1]: proftpd.service: control process
exited, code=exited status=1 Sep 09 17:58:10 root.MYDMOMAIN.de
systemd[1]: Failed to start LSB: Starts ProFTPD daemon.
— Subject: Unit proftpd.service has failed
— Defined-By: systemd

— Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

— Unit proftpd.service has failed.

— The result is failed. Sep 09 17:58:10 root.MYDMOMAIN.de systemd[1]: Unit proftpd.service entered failed state.

Two thing I don't understand:

1. "unable to determine IP address of 'root.MYDMOMAIN.de'" what does this mean? Have I to set a subdomain with "root"?
2. "error processing configuration file '/etc/proftpd/proftpd.conf'" config broken? I checked my config with another config from another server – it's the same…

If you need the proftpd.conf tell me – post would be to long for that.

Pls help me 🙁 thanks.