Android Firebase - setPersistenceEnabled(true) crashing the app

Question

So I was just trying out Firebase to update Toolbar label of activities from realtime database. I am getting the following error:

12-21 00:25:19.890 10295-10295/         


        

Answer 1

boolean flag = true; //before onCreate() method

//inside onStart() Method
if(flag)
{ 
  firebaseDatabase.setPersistenceEnabled(true);
  flag = false;
}