Fb Instant Game Not Working

[Aidid Alam]

Hey I'm very new in javaScript and Phaser. So I'm not sure what wrong I'm doing.

But my game is not Loading .It just stuck on 0%

FBInstant.initializeAsync().then(function() {

let gameConfig = {
        type: Phaser.AUTO,
        backgroundColor:0x87ceeb,
        scale: {
            mode: Phaser.Scale.FIT,
            autoCenter: Phaser.Scale.CENTER_BOTH,
            parent: 'thegame',
           width: window.innerWidth,
           height: window.innerHeight
        },
        physics: {
            default: 'arcade'
        },
        scene: [welcomeGame,
				playGame,
				resumeGame,
				gameOver
				]
    }
    game = new Phaser.Game(gameConfig);
    
});


class welcomeGame extends Phaser.Scene{