Facebook instant leaderboard

Sorry for my bad english : I am developing leaderboard on facebook instant game with WebGL. I connect player with chooseAsync method and i can set my score, but i did not get other player’s score, rank and name. because entry.length = 0 so how to fix it. I don’t have too much knowledge of WebGL.

FBInstant.getLeaderboardAsync(getLeaderboardName())
.then(function (leaderboard) {
    return leaderboard.getEntriesAsync(10, 0); 
})
.then(function (entries) {
    console.log(entries.length);
    entries.forEach(function (entry) {
        gameinstance.SendMessage('Game_Manager', 'GenerateLeaderBoard', `${entry.getRank()}|${entry.getPlayer().getName()}|${entry.getScore()}`);
    });
})
.catch(function (error) {
    console.error('Error reading leaderboard:', error);
});