: Cannot read property 'isParent' of undefined

Phaser 3
1 
    var config = {
          type: Phaser.AUTO,
          parent: 'phaser-example',
          width: 656,
          height: 952,
          physics: {
            default: "arcade",
            arcade: {
              gravity: {y: 200},
            }
          },
          backgroundColor: 0x000000,
          scene: [content, homepage, pickship, Game1, Game2]
       };

    var game = new Phaser.Game(config);

my preload
this.load.image(“background”, “assets/space.png”);
this.load.image(“ast”, “assets/spaceship.png”);
this.load.image(“laser”, “assets/laser.png”);
this.load.image(“enemy”, “assets/enemy.png”);

var score = 0;
var cursors;
var enemy;
var bullet;
var bullets;
var reset;
var player;

class Game1 extends Phaser.Scene {
constructor() {
super(“gameova”);
}

create() {

   var Bullet = new Phaser.Class
   ({
   Extends: Phaser.GameObjects.Image,
   initialize:

   function Bullet (scene)
    {
        Phaser.GameObjects.Image.call(this, scene, 0, 0, "laser");
        this.speed = Phaser.Math.GetSpeed(300, 1);
    },

    fire: function (x, y)
    {
       this.setPosition(x, y);
       this.setActive(true);
       this.setVisible(true);
    },

    update: function (time, delta)
     {
       this.y -= this.speed * delta;
       if (this.y > 822)
        {
           this.setActive(false);
           this.setVisible(false);
        }
      }
    });

      bullets = this.physics.add.group({
         classType: Bullet,
         maxSize: 10000,
         runChildUpdate: true
     });


     this.background = this.add.tileSprite(0, 0, config.width, config.height, "background")
     this.background.setOrigin(0, 0);

     Game1.score = this.add.text(12, 10, "Score" + score, {font: "24px Arial", fill: "white"});

     cursors = this.input.keyboard.createCursorKeys();
     player = this.add.image(config.width/2 +10, config.height/2 +10, "ast").setScale(0.56);

     enemy = this.physics.add.group({
         key: "enemy",
         repeat: 4,
         setXY: {x: 122, y: 4, stepX: 100}
      });

     this.physics.add.collider(this.enemy, this.bullet, this.enemyDone, null, this);
    //the enemyDone function 
     //player.setCollideWorldBounds(true); this is also a problem because it says its not a function


     reset = this.add.text(580, 10, "Reset", {font: "24px Arial", fill: "yellow"});
     reset.inputEnabled = true;
     reset.setInteractive();
     reset.on("pointerdown", function (pointer) {
        this.scene.start("gamee");
     }, this)
  }

update(time, delta) {

    this.background.tilePositionY -= 0.4;

    if (cursors.left.isDown) {
      player.x -= 10;
    }

    else if (cursors.right.isDown) {
      player.x += 10;
    }

    if (cursors.up.isDown) {
      player.y -= 10;
    }

    else if (cursors.down.isDown) {
      player.y += 10;
    }

    else if (cursors.space.isDown) {
          bullet = bullets.get();
      if (bullet)
      {
         bullet.fire(player.x, player.y);
      }
   }
   score++;
   Game1.score.setText("Score: " + score);
   }
 }
 function enemyDone(bullet, enemy)
 {
    enemy.disableBody(true, true);
 }

//problem is this function

2

Hey, what line is the error being thrown on? Can you get your code to run on codepen.io or a similar website? If not, can you paste all of your code?

3

for some reason i am unable to upload files. this is my code for the game play yet i am having issues with isParent is doesnt show which line but when ever i remove the enemyDone function from collider and the whole function then it works but i need it to destroy enemy.

Never mind i discovered my error it was assiging var bullet and i needed to add 1 more collider which