Error building source code access plugin

I’m writing a plugin for Emacs support as the Source Code Access. How do I compile the plugin and load the module once I have everything I need? I have the folder in the Engine/Plugins/Development section. I am currently trying the following command:

$ mono Binaries/DotNET/UnrealBuildTool.exe Mac Development UE4Editor -module EmacsSourceCodeAccess

But, this fails with: ERROR: No modules found to build. All requested binaries were already built.