Installing Appium server on Windows -- how to get past grunt errors?

I'm using this guide:

https://github.com/appium/appium/blob/master/docs/running-on-windows.md

And on this step:

grunt configAndroidBootstrap

I can't get it to run. I've tried:

1. Running it inside node.
2. GitHub\appium\node_modules\.bin\grunt.cmd configAndroidBootstrap

Running \appium\node_modules\.bin\grunt.cmd by itself works, it does something at least. But when I add the configAndroid.. part it does:

Running "configAndroidBootstrap" task
The system cannot find the path specified.
Warning: Task "configAndroidBootstrap" failed. Use --force to continue.

Aborted due to warnings.

Ideas?

Thanks.