Custom Icons

I am learning to build custom nodes and all is going well other than the creation of the custom icons, I followed your example in the video and modified it to grant the MyMini permission for spawning minis. All seems well except what I imagine is the easy part, making an icon. I've tried everything I know and all I get is the default hoodie icon regardless. I've tried uploading the 512x512 png image from both imgur and dropbox and got the same outcome.

This screenshot is my first attempt.

I then went into image library and found the id and added it with the same result as you see in these pics.

For what it's worth here is a screenshot of my console in the carbon panel which seems to confirm the image uploaded.

I'm fairly certain that this my own lack of knowledge and I am missing something. Any help you can offer is appreciated.

Love Skill Tree as both a player and server operator. 

Thanks.