title: storyboard?.instantiateViewController(withIdentifier: " ") as! viewcontroller
body: <p>I have as a Menu tableview in my custom navigation bar. If i click on one cell , it should take me to another view controller. But my app crashes when i click on it.</p>
  
  <pre><code>func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -&gt; Int {
  
      return menu_items.count  //It has 5 values
  }
  
  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -&gt; UITableViewCell {
  
      let cell = UITableViewCell(style: UITableViewCellStyle.value1, reuseIdentifier: "cell")
  
      cell.textLabel?.text = menu_items[indexPath.row]
      cell.textLabel?.textColor = .white
  
      return cell
  }
  
  func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
  
  
      let item = menu_items[indexPath.row]
  
      if (item == "Patienten") {
  
  
           tableView.removeFromSuperview()
  
          let vc =  self.storyboard?.instantiateViewController(withIdentifier: "patientView") as! patientViewVC //App crashes here
          self.present(vc, animated: false, completion: nil)
  
      } else if (item == "Mitarbeiter") {
  
  
      } else if (item == "Kalender") {
  
  
      } else if (item == "Tourenplanung") {
  
  
         tableView.removeFromSuperview()
  
          let vc =  storyboard?.instantiateViewController(withIdentifier: "tour") as! tourVC //App crashes here
          self.present(vc, animated: false, completion: nil)
  
  
      }else if (item == "Abmelden") {
  
          let vc = self.storyboard?.instantiateViewController(withIdentifier: "loginvc") as! LoginVC  //App crashes here
          self.present(vc, animated: false, completion: nil)
      }
  
  
      let selectedCell:UITableViewCell = tableView.cellForRow(at: indexPath)!
      selectedCell.contentView.backgroundColor = colorLightGreen
  
  }
  </code></pre>
  
  <p>}</p>
  
  <p><strong>I have many times verified all Identifier names and view controller names are correct.</strong></p>