Ember deprecation warning and str.replace error in simple app

I'm new to Ember and am trying to set up a fairly simple app. Fetch some data from the server and list it, but I keep running into a

"Usage of Ember.DeferredMixin or Ember.Deferred is deprecated."

warning and a

"TypeError: str.replace is not a function"

error, and I can't for the life of me figure out why.

Everything should be here: http://ift.tt/14JbkqK

Could anyone please tell me what the heck I'd doing wrong?

Thanks for your time!