title: The default app has not been configured yet
body: <p>I'm trying to upgrade my app to the new version of Firebase. I went through the setup guide and edited all of my code to match the new syntax. However, when I run the app, I get these two errors. </p>
  
  <pre><code>The default app has not been configured yet.
  Terminating app due to uncaught exception 'MissingDatabaseURL', reason: 'Failed to get FIRDatabase instance: FIRApp object has no databaseURL in its FirebaseOptions object.'
  </code></pre>
  
  <p>I have  <code>FIRApp.configure()</code> in the AppDelegate and I have the GoogleServices-Info.plist imported into my project. The plist has all of the correct info as well. Anyone else running into this or know how to fix it?</p>