Dedicated server "The map specified on the commandline not found"

I have tried around 3 days now repeatedly setting up new projects and building/packaging them to try to set up 2 executables (server.exe and client.exe) but I keep facing the same problem over and over again.

Whenever I’m done building and run my server (server.exe -log) and then run my client (client.exe 127.0.0.1) it keeps telling me The map specified on the commandline not found.

I made sure my project settings have a default server map in the editor.

Excuse me for being new but I haven’t really found a lot of information on how to do this and I’m about to give up on trying, thanks for reading!