Add VPN "Error: unable to load VPN connection editor"

Hello to you all,

recently I encountered a problem when I tried adding a VPN connection via the Network settings.

When I tried adding a "Multi-protocol VPN client (openconnect) the before-mentioned error message is shown.

I already tried to google the problem and I already tried to install “nm-connection-editor”, but this doesn’t solve my problem. “openconnect” is also installed.

My system is up-to-date.

Thank you very much in advance for your help!