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Hi everybody! I have a problem with a loop in my game. The problem is this: I have a loop that after certain seconds it executes and generates some sprites in the game (it takes it from a group), it works fine the first time. But after the specified seconds pass and the loop executes again it throws me this error: "Uncaught TypeError: Cannot read property 'apply' of undefined" Here's the Code (there are 3 loops in total, but for the example i just focused in the first). /Creation of the fire traps this.fireballs = game.add.group(); this.fireballs.createMultiple(100, 'fireball'); this.fireballs.callAll('animations.add', 'animations', 'shoot', [0,1,2,3], 16, true); game.physics.arcade.enable(this.fireballs); this.fireballs.enableBody = true; //Multiple Fire traps this.loop1 = game.time.events.loop(2000, this.activateMultipleFireTraps('1'), this); //this.loop2 = game.time.events.loop(4000, this.activateMultipleFireTraps(2), this); //this.loop3 = game.time.events.loop(6000, this.activateMultipleFireTraps(3), this); activateMultipleFireTraps: function(position){ if(position == '1'){ var firePositions = [[528, 7488], [528, 7360], [528, 7232], [528, 7088]]; var index = 0; for(index = 0; index < firePositions.length; index++){ var fire = this.fireballs.getFirstDead(); fire.anchor.setTo(0.5); fire.scale.setTo(0.5); fire.scale.x = -1; fire.reset(firePositions[index][0], firePositions[index][1]); fire.body.velocity.x = -150; fire.animations.play('shoot'); } } else if(position == 2){ var firePositions = [[0, 7552], [0, 7424], [0, 7296], [0, 7168]]; var index = 0; for(index = 0; index < firePositions.length; index++){ var fire = this.fireballs.getFirstDead(); fire.anchor.setTo(0.5); fire.scale.setTo(0.5); fire.scale.x = 1; fire.reset(firePositions[index][0], firePositions[index][1]); fire.body.velocity.x = 150; fire.animations.play('shoot'); } } else{ var firePositions = [[112, 7040], [256, 7040], [400, 7040]]; var index = 0; for(index = 0; index < firePositions.length; index++){ var fire = this.fireballs.getFirstDead(); fire.anchor.setTo(0.5); fire.scale.setTo(0.5); fire.scale.y = -1; fire.reset(firePositions[index][0], firePositions[index][1]); fire.body.velocity.y = 150; fire.animations.play('shoot'); } } }, I dont know why it doesnt work. Thanks!