leader board could not working and its can'tpost the score ?

When i am send the request to the leader board to post the scone on the leader board then request can’t to send it and show the some error and when i am request to show leader board to show the leader board Ui then show the massage to some thing have a problem ?
who i am can solve , And answer me as soon as possible

	Social.ReportScore (10, leader.leaderboard_played_levels, (bool success) => {
		try {
			if (success) {

				txt.text = ("scor");
			} else {
				txt.text = ("not score");	
		} catch (System.Exception ex) {
			txt.text = ex.ToString ();

try it on real device.