After a recent upgrade to macOS Mojave, my machine was not able to debug in GoLand due to the error below:
could not launch process: exec: "lldb-server": executable file not found in $PATH
To fix this you have to install xcode-select, a command-line utility on macOS: Type in the command below into your terminal to install xcode-select.
xcode-select --install
After installing xcode-select, everything was working.