Swift SIGABRT Error? But I resolved it?

Question

I have yet another error, its the common swift error

Thread 1: signal SIGABRT

I know how to fix this error. Here is my recent question. Can't resolve error: Thread 1: signal SIGABRT in swift XCODE

But now I am making a new project, and I got this error! So I tried to fix it, I thought I got it - but I didn't.. I have checked all my outlets and everything, But there is no trace of where this is coming from...

Here is my code:

import UIKit

class ViewController: UIViewController {
//Variables
var tempature:Int = 50
var battery:Int = 100
var monsterCount:Int = 0

//Outlets
@IBOutlet weak var BatteryLevel: UILabel!
@IBOutlet weak var TempDisplay: UILabel!

//The spy camera
@IBOutlet weak var monsterImageDisplay: UIImageView?

//The background image
@IBOutlet weak var backgroundImageShow: UIImageView!

//Functions
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    monsterImageDisplay?.isHidden = true
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

//The interval to keep things going
var helloWorldTimer = Timer.scheduledTimer(timeInterval: 3.0, target: self, selector: Selector(("spawnMonstor")), userInfo: nil, repeats: true)

func spawnMonstor() {
    monsterImageDisplay?.isHidden = false
    monsterCount += 1
    if monsterCount >= 3 {
        let randomNumberBackgroundImage = arc4random_uniform(10)
        if randomNumberBackgroundImage >= 5 {
            backgroundImageShow.image = UIImage(named: "main-room-jumpTop")
        } else if randomNumberBackgroundImage <= 5 {
            backgroundImageShow.image = UIImage(named: "main-room-jumpBottom")
        }
    } else if monsterCount >= 5 {
        let alert = UIAlertController(title: "GAME OVER", message: "Sorry! You died...", preferredStyle: UIAlertControllerStyle.alert)
        alert.addAction(UIAlertAction(title: "Okay..", style: UIAlertActionStyle.default, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }
}


//The shock rooms button

@IBAction func ShockRooms(_ sender: Any) { monsterImageDisplay?.isHidden = true
}

}

Answer 1

1. Check that your UIImage names are the EXACT same names as the ones in your xcassets folder.

2. Instead of using the helloWorldTimer, write this at the top of your class, underneath your outlets:

var helloWorldTimer = Timer()

And then inside of your viewDidLoad, add:

helloWorldTimer = Timer.scheduledTimer(timeInterval: 3.0, target: self, selector: Selector(("spawnMonstor")), userInfo: nil, repeats: true)