   
   // MARK: TV Data Source related
   override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-    return checklist10?.checklist10Items.count
+    return (checklist10?.checklist10Items.count)!
   }
   
   override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    
    if let cell = tableView.cellForRow(at: indexPath) {
      let checklist10Item = checklist10?.checklist10Items[indexPath.row]
      checklist10Item.toggleChecked()
      configureCheckmark(for: cell, with: checklist10Item)
    }
    
    tableView.deselectRow(at: indexPath, animated: true)


  
  required init?(coder aDecoder: NSCoder) {
    checklist10?.checklist10Items = [Checklist10Item]()
    super.init(coder: aDecoder)
    print("Documents folder is \(documentsDirectory())")
    print("Data file path is \(dataFilePath())")
