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Andrew Souza70 Points
a problem with messagesReferance.
My Android Studio says it "Cannot resolve symbol 'messagesReferance' "
The reference he was using was created in the code above.
// TODO Get a reference to the "messages" node of your Firebase DatabaseReference messages = firebase.getReference(MESSAGES_FIREBASE_KEY);
The reference was called messages, not messagesReference. So it should look like