In the code below, the collision check works fine but when I try to use the commented out lines, my game doesn't load. I've tried a bunch of stuff but this.nope.ohmygodplsmakeitstop var game = new Phaser.Game(400, 490, Phaser.AUTO, '');var main_state = {preload: function() { this.game.load.image('bird', 'assets/bird.png'); this.game.load.image('cat', 'assets/catyo.png'); },create: function() { this.bird = this.game.add.sprite(100, 245, 'bird'); this.cat = this.game.add.sprite(300, 245, 'cat');},update: function() { this.game.physics.collide(this.bird, this.cat); //this.cat.rotation = this.game.physics.arcade.angleBetween(this.cat, this.bird); //this.game.physics.arcade.moveToObject(this.cat,this.bird);}};game.state.add('main', main_state); game.state.start('main');