SSH Server troubles

Hello,
The SSH Server stands on yellow, when I click on start, I receive the follow error:

Job for sshd.service failed because the control process exited with error code. See "systemctl status sshd.service" and "journalctl -xe" for details.

The status are:
sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Sat 2017-12-09 19:30:54 CET; 28s ago
     Docs: man:sshd(
           man:sshd_config(5)
  Process: 2827 ExecStart=/usr/sbin/sshd -D $OPTIONS (code=exited, status=255)
 Main PID: 2827 (code=exited, status=255)

Dec 09 19:30:54 vps.erotiekfabriek.be systemd[1]: sshd.service: main process exited, code=exited, status=255/n/a
Dec 09 19:30:54 vps.erotiekfabriek.be systemd[1]: Failed to start OpenSSH server daemon.
Dec 09 19:30:54 vps.erotiekfabriek.be systemd[1]: Unit sshd.service entered failed state.
Dec 09 19:30:54 vps.erotiekfabriek.be systemd[1]: sshd.service failed.

Thanks in Advance.

Whats in your sshd_config file ?

check your ssh port set in the configuration, in most cases this could be related with already used port...but could be also something else.