Unable to start receiver com.backendless.push.BackendlessBroadcastReceiver

I have tried to set up push notifications by following the Backendless Video tutorial but when I run the emulator, the app always crashes. This is the read out i get. Can you please tell me where i’m going wrong?

E/AndroidRuntime: FATAL EXCEPTION: main
                                                 Process: com.pushdemo.pushdemo, PID: 3634
                                                 java.lang.RuntimeException: Unable to start receiver com.backendless.push.BackendlessBroadcastReceiver: java.lang.RuntimeException: AUTHENTICATION_FAILED
                                                     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2732)
                                                     at android.app.ActivityThread.-wrap14(ActivityThread.java)
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)
                                                     at android.os.Handler.dispatchMessage(Handler.java:102)
                                                     at android.os.Looper.loop(Looper.java:148)
                                                     at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                  Caused by: java.lang.RuntimeException: AUTHENTICATION_FAILED
                                                     at com.backendless.push.BackendlessBroadcastReceiver.onError(BackendlessBroadcastReceiver.java:148)
                                                     at com.backendless.push.BackendlessBroadcastReceiver.handleRegistration(BackendlessBroadcastReceiver.java:292)
                                                     at com.backendless.push.BackendlessBroadcastReceiver.handleIntent(BackendlessBroadcastReceiver.java:159)
                                                     at com.backendless.push.BackendlessBroadcastReceiver.onReceive(BackendlessBroadcastReceiver.java:128)
                                                     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2725)
                                                     at android.app.ActivityThread.-wrap14(ActivityThread.java) 
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421) 
                                                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                     at android.os.Looper.loop(Looper.java:148) 
                                                     at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 




MAIN ACTIVTY
Backendless.initApp(this, "XXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX", "XXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX", "v1");

Backendless.Messaging.registerDevice("XXXXXXXXXXXX", new AsyncCallback<Void>() {
    @Override
    public void handleResponse(Void response) {
        Log.i( "MY APP", "Device has been registered");
    }

    @Override
    public void handleFault(BackendlessFault fault) {
        Log.e( "MY APP", "server reported and error -" + fault.getMessage() );
    }
});

RESOLVED - the secret key was missing a digit.