Custom App 'Add Card' Disabled?

Hey guys,

I am attempting to create a custom card using the Domo Development Studio. 

 I have properly logged in and launched the app using Git, however when I navigate to the Domo Asset Library (which I need to manually type in the URL with the address bar) and I click the orange button 'add card' I get this error.

 

Is there something that I am doing wrong here? I feel that I am following all the proper steps.