Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\\Users\\Aaron>cd /DevKit The system cannot find the path spec
Write your path to ruby installation folder The pattern is three dashes then move to next line Add another dash, space and path
--- - C:\Ruby21-x64
(Since you can see three dashes have already been put at the end of your config.yml file so you basically need to add the last line)