Schema Update run in a loop

[Gerolsteiner99]

Running nipap-agent on a CentOS7 virtual box. After some installation issues I'm at this point without an idea for going forward:

• Start the service:
  [root@client1-nipap nipap]# systemctl start nipapd.service
  Job for nipapd.service failed because the control process exited with error code. See "systemctl status nipapd.service" and "journalctl -xe" for details.

• Output from journalctl -xe
  Mar 12 09:28:23 client1-nipap systemd[1]: nipapd.service holdoff time over, scheduling restart.
  Mar 12 09:28:23 client1-nipap systemd[1]: Starting nipapd daemon...
  -- Subject: Unit nipapd.service has begun start-up
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit nipapd.service has begun starting up.
  Mar 12 09:28:23 client1-nipap nipapd[22406]: ERROR: NIPAP PostgreSQL database is outdated. Schema version
  Mar 12 09:28:23 client1-nipap nipapd[22406]: HINT: You can automatically install required extensions and
  Mar 12 09:28:23 client1-nipap systemd[1]: nipapd.service: control process exited, code=exited status=1
  Mar 12 09:28:23 client1-nipap systemd[1]: Failed to start nipapd daemon.
  -- Subject: Unit nipapd.service has failed
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit nipapd.service has failed.
  --
  -- The result is failed.
  Mar 12 09:28:23 client1-nipap systemd[1]: Unit nipapd.service entered failed state.
  Mar 12 09:28:23 client1-nipap systemd[1]: nipapd.service failed.

• Hint to solve the issue:
  --auto-install-db

• That was the output from this solution:
  [root@client1-nipap nipap]# ./nipapd --auto-install-db
  ERROR: NIPAP PostgreSQL database is outdated. Schema version 6 is required to run but you are using 3
  HINT: You can automatically install required extensions and the nipap schema with --auto-install-db

What can I do now?