title: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT]
body: <p>I have been getting this issue.. followed the upgrade guide for new firebase sdk...saved the google services json file in app directory.. still the same error as you but for the database...</p>
  
  <pre><code>Caused by: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.
  </code></pre>