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I am using a webview and when I upload the data to the webview it shows me these messages. What should I modify, is it a mistake, can it cause problems for my application?
import UIKit
import WebKit
class BeneficiosViewController: UIViewController , WKNavigationDelegate{
    // MARK: - Declarando Variables
    var webView: WKWebView!
    // MARK: - LOAD
    override func viewDidLoad() {
        super.viewDidLoad()
    self.title = "Beneficios"
    self.navigationController?.navigationBar.titleTextAttributes=[NSAttributedString.Key.font: UIFont(name: "carnas", size: 22) as Any]
        let url = URL(string: "https://www.sites.google.com/pageweb")
            webView.load(URLRequest(url: url!))
        webView.addObserver(self, forKeyPath: #keyPath(WKWebView.estimatedProgress), options: .new, context: nil)
            webView.allowsBackForwardNavigationGestures = true
    }
    // MARK: - Funcion para cargar una web
    override func loadView(){
        webView = WKWebView()
        webView.navigationDelegate = self
        view = webView
    }
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "......."{
            print(Float(webView.estimatedProgress))
        }
    }
}
Log Detail:
2019-11-22 09:02:25.003545-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1
2019-11-22 09:02:25.003696-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1
2019-11-22 09:02:25.004011-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1
2019-11-22 09:02:25.004173-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1
2019-11-22 09:02:25.004466-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1
2019-11-22 09:02:25.004614-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1
2019-11-22 09:02:25.004820-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1
2019-11-22 09:02:25.004965-0500 ScharffDev[6600:1264134] [Process] kill() returned unexpected error 1

 
    