As a consequence of introducing new features in our application, we've also introduced some nasty show stopping bugs. In this lesson, I'll go over how to catch the errors in our api calls to effectively determine what the necessary fixes need to be. Lastly, I'll briefly give an example of how to implement dependency injection for our <b>AppDetailController </b> component. There are many advantages of doing this but I just wanted to give you a quick taste of what it looks like for now.