Game Config Validator
Note
In asset versions below 1.8.1 this tool named Game Settings Checker
Game Config Validator is a special window, which will check all game and unit settings and show warnings, if you forget to setup something. If the scene setted up correctly, it will tell you that everything is fine.
You can access this window from the top Unity menu by clicking RTS Starter Kit -> Game Config Validator.

It is a good idea to run this check after units settings changes or when you created and setup a new unit.
Note
However, please note that it cannot detect every possible problem.