Problem with adding Leaderboard

Phaser 3
1

Hello everyone, I am new in phaser 3 game development . I am trying to build a social game for the Facebook Instant Games platform. I create a simple phaser 3 game and now I want to add leaderboard with my game . when add this code my game

this.facebook.on(‘getleaderboard’, function (leaderboard)
{
this.leaderboard = leaderboard;

    }, this);

    this.facebook.getLeaderboard('my_leaderboard');

this error message show the console Uncaught TypeError: Cannot read property ‘on’ of undefined

please any one can help me. Thanks everyone.

2

This is telling you that this.facebook is undefined.

The most likely reason is the FB plugin is missing.

3

thanks samme Patron for your response