When trying to restart any service on a CentOS server, i get error

Failed to list units: Activation of org.freedesktop.systemd1 timed out

Server won’t even reboot, here is what i get when i try reboot or restart a service.

[root@server ~]# service httpd restart
Redirecting to /bin/systemctl restart  httpd.service
Failed to restart httpd.service: Activation of org.freedesktop.systemd1 timed out
See system logs and 'systemctl status httpd.service' for details.
[root@server ~]# reboot
Failed to start reboot.target: Activation of org.freedesktop.systemd1 timed out
See system logs and 'systemctl status reboot.target' for details.
Failed to open /dev/initctl: No such device or address
Failed to talk to init daemon.
[root@server ~]# systemctl reboot
Failed to start reboot.target: Activation of org.freedesktop.systemd1 timed out
See system logs and 'systemctl status reboot.target' for details.
[root@server ~]# systemctl --failed
Failed to list units: Activation of org.freedesktop.systemd1 timed out
[root@server ~]# 

problem is solved by force rebooting with command.

reboot -f