"Chain validation failed" in Android Studio with Firebase

When I try to run the java android Code in debug mode

@Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       Firebase.setAndroidContext(this);
       Firebase firebase = new Firebase("https://androidcookbook-98385.firebaseio.com");
       firebase.createUser("myemail@mydomain.com", "mypassword", new Firebase.ValueResultHandler<Map<String, Object>>(){

           @Override
           public void onSuccess(Map<String, Object> stringObjectMap) {
               Log.i("Firebase", "successfully created user user account with uid:"+ stringObjectMap.get("uid") );
           }

           @Override
           public void onError(FirebaseError firebaseError) {
               Log.i("Firebase", "Error on creating user!!!! "+firebaseError.getMessage());
           }
       });
   }

I get the error

There was an exception while performing the request: Chain validation failed

I have tried to add the SHA1 code from Gradle > app > Tasks > Signing Report to the Firebase main project configuration .

I still get the previous error The Gradle console gives me only a debug sha1!!!