Add this file to compile and add to local host.
#if targetEnvironment(simulator)
let localDomain = "127.0.0.1"
#else
let localDomain = "Kyles-MacBook-Pro.local"
#endif
Go to mac System Preferences -> Sharing
See on that screen it says:
"Computers on your local network can access your computer at:"
Below that is the name you should set to `localDomain` for the else case. Simulator should be 127.0.0.1.