Firebase Database connection was forcefully killed by the server

[filipatbnp]

readme for database https://github.com/firebase/quickstart-android/blob/master/database/README.md does not mention anything about creating realtime database

if not - app quietly does nothing (it does not work but you have to be logcat-proficient to know why)

pc_0 - Firebase Database connection was forcefully killed by the server. Will not attempt reconnect. Reason: Firebase error. Please ensure that you have the URL of your Firebase Realtime Database instance configured correctly.

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