Background doesnt show up from chap 1 page 46 2d games

I need some help… the background isn’t showing up. Here is what i have typed into Xcode:

import SpriteKit

class GameScene: SKScene {
override func didMove(to view: SKView) {
backgroundColor =

    let background = SKSpriteNode(imageNamed:  "background1")
    background.position = CGPoint(x: size.width/2, y: size.height/2)

Have you loaded the background1 image along with all the other images into your Assets.xcassets?