systemctl restart ntpd
Job for ntpd.service failed. See "systemctl status ntpd.service" and "journalctl -xn" for details.
SC-1:~ # journalctl -xn
-- Logs begin at Thu 2020-01-16 19:22:33 EET, end at Sun 2020-01-19 16:45:27 EET. --
Jan 19 16:45:27 SC-1 systemd[1]: Stopping NTP Server Daemon...
-- Subject: Unit ntpd.service has begun shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman.../systemd-devel
--
-- Unit ntpd.service has begun shutting down.
Jan 19 16:45:27 SC-1 systemd[1]: Starting NTP Server Daemon...
-- Subject: Unit ntpd.service has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman.../systemd-devel
--
-- Unit ntpd.service has begun starting up.
Jan 19 16:45:27 SC-1 ntpd[27599]: ntpd 4.2.8p10@1.3728-o Fri Apr 7 09:23:20 UTC 2017 (1): Starting
Jan 19 16:45:27 SC-1 ntpd[27599]: Command line: /usr/sbin/ntpd -p /var/run/ntp/ntpd.pid -g -u ntp:ntp -c /etc/ntp.conf
Jan 19 16:45:27 SC-1 ntpd[27600]: proto: precision = 0.109 usec (-23)
Jan 19 16:45:27 SC-1 ntpd[27600]: unable to bind to wildcard address :: - another process may be running - EXITING
Jan 19 16:45:27 SC-1 start-ntpd[27596]: Starting network time protocol daemon (NTPD)
Jan 19 16:45:27 SC-1 systemd[1]: PID 27600 read from file /var/run/ntp/ntpd.pid does not exist or is a zombie.
Jan 19 16:45:27 SC-1 systemd[1]: Failed to start NTP Server Daemon.
-- Subject: Unit ntpd.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman.../systemd-devel
--
-- Unit ntpd.service has failed.

It would be great if you also shared what you have done so far to solve this problem. Such as, using a search engine to find those error messages.

Having said that, this message:
seems to say that the NTP daemon can't use an address because it's already in use.

Now, normally the NTP daemon listens at port 123. If the internet search above doesn't yield a result that fits my situation, I would use the ss or netstat command to find out if another process occupies this port. If that doesn't help, I would run the NTP daemon with the -d or -D options to get more output. I suppose that there is a config file, probably under /etc/sysconfig, where you can add those options.

Please post: