4.8 Dedicated server via Blueprints

Is it possible to make a dedicates server via blueprints in 4.8 ?
I tried to make one in 4.7.6 but I couldn’t find how to do it. All i found was about to open my project in Visual studio etc. but still it all of the tutorials I watched was useless, at least it didn’t worked for me. At launch if I select WindowsServer i got an Error :

Program.Main: ERROR: Server target not found. Server target is required with -server and -cook or -cookonthefly

Any kind of help how to make a dedicated server if I only using blueprints would be nice.
Thanks for helping