Free shipping not working properly

I have enabled your plugin. Configured the options I want to allow free shipping and it is not working. See screenshots below.

https://www.dropbox.com/s/jana75lpzv9y347/Screenshot%202015-03-30%2023.45.47.png?dl=0

https://www.dropbox.com/s/y4bab4f3hfnj5ct/Screenshot%202015-03-30%2023.46.21.png?dl=0

https://wordpress.org/plugins/woocommerce-advanced-free-shipping/