NetworkManager connection problem on Arch Linux [SOLVED]

networkmanager-openvpn should be installed for managing OpenVPN via GUI on Arch Linux.

I added configuration for my OpenVPN connection but it was not connecting via GUI without any error message. I was able to connect using openvpn command.

I checked the log with

journalctl | grep NetworkManager

and I noticed

(gnome-control-center:6433): libnm-glib-WARNING **: Device activation failed: The VPN service ‘org.freedesktop.NetworkManager.openvpn’ was not installed.

Restarting Networkmanager…

sudo systemctl restart NetworkManager.service

solved this issue.