Oh, also — although it’s of course possible to add RapidEars to the sample app, the tutorial doesn’t explain how to do that. It’s written on the assumption that you are creating a new app following the tutorial steps. I would not add RapidEars to the sample app but instead follow the tutorial with a new app. This is much better because you’ll know the app is set up correctly but also because it very quickly walks you through the major functions of the SDK so you have a sense of what is going on once you’re done.