title: Unable to write over firebase database
body: <p>I am trying to link firebase realtime time database over my android application using following code:</p>
  
  <pre><code>FirebaseDatabase database = FirebaseDatabase.getInstance();
  DatabaseReference root = database.getReference("users");
  
   User user = new User("Hey","hey@hey.ca","987654321");
   root.setValue(user);
  </code></pre>
  
  <p>coding is not pushing anything over the database: for debugging I tried to print the values for root and database that worked fine, returned proper address. Where as when I implemented root.setValue(user).isSuccessful() it returns false. </p>