yo ember tutorial: Client doesn't have permission to access the desired data

I'm doing the YoEmber tutorial: https://github.com/zoltan-nz/library-app. Getting the following error- Uncaught Error: permission_denied at /authors: Client doesn't have permission to access the desired data.

I create a Firebase database, as the tutorial requires, with the following rules: { "rules": { ".read": true, ".write": true } } Still, the database is not getting authenticated. I also copied the correct apiKey, authDomain, databaseURL, projectId, storageBucket, and messagingSenderId from firebase.

Anyone have any ideas?