Add Route

I’m I missing something here, been a long time that I used this command but to me it looks ok.

I am connected to the Internal network over VPN but unable to connect to a server on the lan, I know its down to a route problem so I added the route see below but get this error 🙁 I’m ready to cry ha ha
cmd

route add 192.168.**.** mask 255.255.255.0 192.168.**.* but I get this error.

The specified mask parameter is invalid. (Destination & Mask) != Destination