Issues saving Json in Core Data

I am trying to save JSON data received from a web service into my core data model. This works by swiping left from a table view cell to save. When I try to look at the saved data from a database, nothing shows. Can someone please have a look? The code below handles persistence.
https://github.com/lexypaul13/Covid-News

Error Message: [] nwprotocolgetquicimageblockinvoke dlopen libquic failed

Code Block 
 func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        let save =  UIContextualAction(style: .normal, title: "Save") { (action, view, completionHandler) in
            completionHandler(true)
                CoreDataManger.sharedInstance.createData()
    }
        save.backgroundColor = .systemBlue
        let swipe =  UISwipeActionsConfiguration(actions: [save])
        return swipe
    }
_

Code Block 
class CoreDataManger: NSObject {
    static let sharedInstance = CoreDataManger()
    private override init() {}
    var newsCoreData: [News] = []
    var article = ArticlesData()
    // MARK: - Core Data Saving support
    func createData(){
        //As we know that container is set up in the AppDelegates so we need to refer that container.
        DispatchQueue.main.async(execute: { [self] in
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        //We need to create a context from this container
        let managedContext = appDelegate.persistentContainer.viewContext
        //Now let’s create an entity and new user records.
        let newsEntity = NSEntityDescription.entity(forEntityName: "News", in: managedContext)!
  for article in self.newsCoreData{
        let news = NSManagedObject(entity: newsEntity, insertInto: managedContext)
 news.setValue("\(article.author ?? "")", forKeyPath: "author")
  news.setValue("\(article.myDescription ?? "")", forKeyPath: "myDescription")
news.setValue("\(article.publishedAt ?? "")", forKeyPath: "publishAt")
         news.setValue("\(article.title ?? "")", forKeyPath: "title")
         news.setValue("\(article.urlImage ?? "")", forKeyPath: "urlImage")
         news.setValue("\(article.urlWebsite ?? "")", forKeyPath: "urlWebsite")
        }
       //Now we have set all the values. The next step is to save them inside the Core Data
        do {
            try managedContext.save()
        } catch let error as NSError {
            print("Could not save. \(error), \(error.userInfo)")
        }
        print(FileManager.default.urls(for: .documentDirectory, in: .userDomainMask))
    }
        )}
}