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Data is not inserting into firebase

Hello to all! I have been Using google firebase with my android apps for more than 2 years. Today while developing a new app I am facing a weird problem. I set up my firebase project on Google firebase Console successfully. I write the code to push data on firebase successfully.

But the problem is that No data inserted in firebase and no Error occurs in the console. I searched online a lot but all in vain. I am pasting Screen shot of my firebase console, database rules and my source code. Kindly guide me.

 database = FirebaseDatabase.getInstance();
  dealer_ref = database.getReference("reg_requests");
   btnSignup.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                   Dealer dealer = new Dealer();


                    String id =    dealer_ref.push().getKey();