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Hello Im new to panda, so this is proberly a very basic q: game.createClass('Alien', { name: 'Hans', health: 10, init: function(myX, myY) { Ninja = new game.Animation('media/ninja_1.png', 'media/ninja_2.png', 'media/ninja_3.png','media/ninja_4.png'); Ninja.animationSpeed = 0.1; Ninja.position.set(game.system.width / 2 - Ninja.width / 2, game.system.height - Ninja.height); //Ninja.anchor.set(0,1); Ninja.addTo(game.scene.stage); this.shape = new game.Rectangle(Ninja.width,Ninja.height); this.body = new game.Body({ position: {x: 100, y: 100}, collisionGroup: 1, collideAgainst: 0 }); this.body.addShape(this.shape); //this.body.collide = this.collide.bind(this); }, //init mousedown: function() { console.log("allo"); game.audio.playSound("swipe", false); } });I keep getting a error when I add this: this.body.collide = this.collide.bind(this); The error is: Cannot read property 'bind' of undefined