How to shoot bullets?

[flagga]

I am creating a game like this: http://www.1001spiele.de/aktion/az-tanks

But I am a noob in Phaser - I programm with pelles c in school, so this does not help me much. I already created a tank and managed it to code the controls. 

Now I am trying to use weapons. I used the example http://phaser.io/examples/v2/weapon/single-bullet but it doesn't work: 

Here is a part of my code (full code uploded):

function create{

    player1 = game.add.sprite(32, game.world.height - 150, 'player1');
    player1.anchor.setTo(0.5,0.5);
    game.physics.p2.enable(player1, false);
    game.physics.arcade.enable(player1);
    player1.body.collideWorldBounds = true;

    cursors = game.input.keyboard.createCursorKeys();
    w = game.input.keyboard.addKey(Phaser.Keyboard.W);
    a = game.input.keyboard.addKey(Phaser.Keyboard.A);
    s = game.input.keyboard.addKey(Phaser.Keyboard.S);
    d = game.input.keyboard.addKey(Phaser.Keyboard.D);
    spacebar = game.input.keyboard.addKey(Phaser.Keyboard.SPACEBAR);

 var weapon = game.add.weapon(30, 'bullet');
    weapon.bulletKillType = Phaser.Weapon.KILL_WORLD_BOUNDS;

    weapon.bulletAngleOffset = 90;

    weapon.bulletSpeed = 400;

    weapon.fireRate = 60;
    
    weapon.trackSprite(player1, 14, 0);

}

function update{

if (spacebar.isDown){

weapon.fire();

}

}

 

example.txt