Additional Custom Fontello icons issue

Hi there. Was wondering if you could help. I am trying to add some custom icons via fontello. I think I followed your instructions correctly, but when I go to select a new icon, the Fontello section has all blank tiles. I have a screen shot of where the Fontello folder is structured within my WP folder as well as an image of the problem.

You can see it here: https://www.dropbox.com/s/ic3tv4etxcvqva5/Screen%20Shot%202016-05-23%20at%207.02.56%20PM.png?dl=0