New Post type and taxonomies not working fully

I am using adding new Post types to the functions.php file (THEMATIC Theme), as well as some custom taxonomies following this tutorial:

https://wp.tutsplus.com/tutorials/theme-development/innovative-uses-of-wordpress-post-types-and-taxonomies/

Making the post type is no problem. I can add taxonomies to the new post type, and it all shows up in the Dashboard.

The problem is, that when I click the taxonomies under the Post type in the dashboard – I get a blank page with the words “Cheatin’ uh?”

I get the same thing when I add a new post, it shows the taxonomies, but when I try to “+add new Taxonomies” nothing happens.

Can anyone tell me what I am doing wrong?