VPN Connection Dial up Error

Good Evening.
I am in search of a solution for an error, that I have received just this morning.
I have attached an image below, in which you are able to view the exact error that appears on my client PC screen.
The necessary VPN sub-system is not available. You can not connect to the remote VPN server.
My client PC is not getting connected to the sub-system, means the VPN server.
The VPN dialer is not working properly. I have tried many times to connect to the server via the VPN Dialer but again and again I receive this error message.
I am looking for a VPN guru who can assist me for this error solution.
If there is anyone out there please respond.

VPN Dialer
The necessary VPN sub-system is not available. You can not connect to the remote VPN server.
