firebase database set funtion does not work

This is my code set function does not work here.And no error shown in console please help me.

var config = {
apiKey: '************************************',
authDomain: 'my-app.firebaseapp.com',
databaseURL: 'http://ift.tt/1Fn9FlZ',
storageBucket: 'gs://my-app.appspot.com'
};
firebase.initializeApp(config);

var rootRef = firebase.database().ref();
rootRef.set({
'like':'5'
});

firebase database rules as follows

{
"rules": {
".read": true,
".write": true,
    "learning": {
  "mngmt_quote":
  {

  },
  "Author":{

  }
 }
 }
 }

I have tried many methods found in internet.no solution found.please help me