Udemy Flappy Bird Issue

import SpriteKit

class GameScene: SKScene {

    // Make the Bird Sprite
    var bird = SKSpriteNode()
    // Make the Sky Sprite for Background Color
    var skyColor = SKColor()

    override func didMoveToView(view: SKView) {
        /* Setup your scene here */

        // Set the Sky Sprite to a color
        skyColor = SKColor(red: 113.0/255.0, green: 197.0/255.0, blue: 207.0/255.0, alpha: 1.0)
        self.backgroundColor = skyColor

        // 2 textures for animating the birds wings
        var birdTexture1 = SKTexture(imageNamed:"Bird1")
        birdTexture1.filteringMode = SKTextureFilteringMode.Nearest
        var birdTexture2 = SKTexture(imageNamed:"Bird2")
        birdTexture2.filteringMode = SKTextureFilteringMode.Nearest

        // Putting the animation together and running it forever
        var animation = SKAction.animateWithTextures([birdTexture1, birdTexture2], timePerFrame: 0.2)
        var flap = SKAction.repeatActionForever(animation)

        // Setting the texture and animation to the bird and the starting position
        bird = SKSpriteNode(texture: birdTexture1)
        bird.position = CGPoint(x: self.frame.size.width / 2.8, y: CGRectGetMidY(self.frame))
        bird.runAction(flap)

        // Add the bird to the scene
        self.addChild(bird)

        // Set the Ground Texture
        var groundTexture = SKTexture(imageNamed: "Ground")
        groundTexture.filteringMode = SKTextureFilteringMode.Nearest

        // Move the Ground
        var moveGroundSprite = SKAction.moveByX(-groundTexture.size().width, y: 0, duration: NSTimeInterval(0.1 * groundTexture.size().width))
        // Reset the Ground
        var resetGroundSprite = SKAction.moveByX(groundTexture.size().width, y: 0, duration: 0.0)
        // Set it to be on loop and last forever (put it in the for loop below
        var moveGroundSpriteForever = SKAction.repeatActionForever(SKAction.sequence([moveGroundSprite, resetGroundSprite]))




        // Set a for loop so that the ground keeps going as far as the bird/player goes
        for var i:CGFloat = 0; i<2 + self.frame.size.width / (groundTexture.size().width); ++i {
            var sprite = SKSpriteNode(texture: groundTexture)
            sprite.position = CGPointMake(i * sprite.size.width, sprite.size.height / 2)
            sprite.runAction(moveGroundSpriteForever)
            self.addChild(sprite)
        }

        // Set the Skyline Texture
        var skylineTexture = SKTexture(imageNamed: "Skyline")
        skylineTexture.filteringMode = SKTextureFilteringMode.Nearest

        var moveSkylineSprite = SKAction.moveByX(-skylineTexture.size().width, y: 0, duration: NSTimeInterval(0.1 * skylineTexture.size().width))
        var resetSkylineSprite = SKAction.moveByX(skylineTexture.size().width, y: 0, duration: 0.0)
        var moveSkylineSpriteForever = SKAction.repeatActionForever(SKAction.sequence([moveSkylineSprite, resetSkylineSprite]))

        // Make it continue like the Ground Texture
        for var i:CGFloat = 0; i<2.0 + self.frame.size.width / (skylineTexture.size().width); ++i {
            var sprite = SKSpriteNode(texture: skylineTexture)
            sprite.zPosition = -20;
            sprite.position = CGPointMake(i * sprite.size.width, sprite.size.height / 2 + groundTexture.size().height)
            sprite.runAction(moveSkylineSpriteForever)
            self.addChild(sprite)

        }

    }

    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
        /* Called when a touch begins */

    }

    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
    }
}