I am getting the following error:
Projects created at console.firebase.google.com must use the new Firebase Authentication SDKs ava
Projects that are created at firebase.google.com, can only use the Firebase Authentication SDKs available from https://firebase.google.com/docs/auth/.
You're using a Firebase 2.x SDK, specifically this createUser() method.
The fact that you're including a dependency on the new Firebase is not enough, you likely also have a dependency on Firebase for Android 2.x somewhere (e.g. compile 'com.firebase:firebase-client-android:2.5.2+'), which you'll need to remove.
I solved this problem so: