Cannot read property 'sys' of undefined

Phaser 3
1

class Enemy extends Phaser.Physics.Arcade.Sprite {
aTurret

constructor(scene, x, y, texture) {
    super(scene, x, y, texture = 'enemy', 'tank1')

    scene.add.existing(this)
    scene.physics.add.existing(this)

    scene.events.on('update', this.update, this)

    this.setVelocity(100, 0);
    this.setCollideWorldBounds(true);
    this.body.bounce.setTo(1, 1);
    this.body.immovable = false;
    this.health = 3;
    this.alive = true;

    this.aTurret = new aTurret(scene)
}

update() {

    this.aTurret.follow(this)
}

}

class aTurret extends Phaser.GameObjects.Sprite {
constructor(scene, x, y, texture = ‘turret’){
super(scene, x, y, texture)

scene.add.existing(this)


}

follow(demon) {
    this.setX(demon.x)
    this.setY(demon.y)
}

}

create() {

let demon = new Enemy(this, 100, 100);

demons = this.physics.add.group();
for (var i = 0; i < 20; i++)
{
var pos = demons.create(new Enemy);
this.physics.add.existing(pos);
}

}

I keep getting error “sys” of undefined and cannot seem to figure it out. The above code is causing this error but I do not know why!

2

there may be other things wrong with your code but
demons.create(new Enemy) should be demons.create(new Enemy(this,0,0))