title: 'UITableView' failed to obtain a cell from its dataSource
body: <p>I updated Xcode and since then I'v problems with my dataBase.
  code:</p>
  
  <pre><code>override func numberOfSections(in tableView: UITableView) -&gt; Int {
      // return the number of sections
      return 1
  }
  
  override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -&gt; Int
  {
      // return the number of rows
      return leadItems.count
  }
  
  func cellForRow(at indexPath: IndexPath) -&gt; UITableViewCell?
  {
      let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! LeadsTableViewCell
  
      // Configure the cell...
      cell.user_name_label.text = leadItems[indexPath.row].user_name
      cell.school_name_label.text = leadItems[indexPath.row].school_name
  
      return cell
  }
  </code></pre>
  
  <p>The error that I get is:</p>
  
  <blockquote>
    <p>Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView (; layer = ; contentOffset: {0, -64}; contentSize: {375, 65802}>) failed to obtain a cell from its dataSource () </p>
  </blockquote>