title: Unsupported configuration prototype table cells must have reuse identifiers
body: <p>I build a <code>UITableView</code> in <code>ViewDidLoad</code> like this:</p>
  
  <pre><code>- (void)viewDidLoad
  {
      CGSize viewSize = self.view.frame.size;
  mainScroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 35, viewSize.width, viewSize.height -149)];
  [mainScroll setPagingEnabled:YES];
  [mainScroll setShowsHorizontalScrollIndicator:NO];
  [mainScroll setDelegate:self];
  [mainScroll setTag:101010];
  
      // #1
      UIScrollView *scroll1 = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, viewSize.width, viewSize.height -149)];
      UITableView *table101 = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, viewSize.width, viewSize.height -149) style:UITableViewStylePlain];
      [table101 setDataSource:self];
      [table101 setDelegate:self];
      [table101 setBackgroundColor:[UIColor clearColor]];
      [table101 setTag:101];
      [table101 setSeparatorStyle:UITableViewCellSeparatorStyleNone];
  
      [scroll1 addSubview:table101];
  
      // #2
      UIScrollView *scroll2 = [[UIScrollView alloc] initWithFrame:CGRectMake(viewSize.width, 0, viewSize.width, viewSize.height -149)];
      UITableView *table102 = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, viewSize.width, viewSize.height -149) style:UITableViewStylePlain];
      [table102 setDataSource:self];
      [table102 setDelegate:self];
      [table102 setBackgroundColor:[UIColor clearColor]];
      [table102 setTag:102];
      [table102 setSeparatorStyle:UITableViewCellSeparatorStyleNone];
  
      [scroll2 addSubview:table102];
  
  [mainScroll addSubview:scroll1];
  [mainScroll addSubview:scroll2];
  [mainScroll setContentSize:CGSizeMake(viewSize.width *2, viewSize.height -149)];
  
  
  
  }
  </code></pre>
  
  <p>In <code>TableViewCell</code> I used this:</p>
  
  <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {
      static NSString *cellIdentifier = @"Cell";
      UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
  
      if (cell == nil) {
          cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
          [cell setSeparatorInset:UIEdgeInsetsMake(0, 15, 0, 15)];
  
      }
  
      NSMutableArray *mutableArray;
  
      if (tableView.tag == 101) {
          mutableArray = self.itemsInTable_Molhaq;
  
      } else if (tableView.tag == 102) {
          mutableArray = self.itemsInTable_Ziyarah;
      }
  
      NSString *labelString = [[mutableArray objectAtIndex:indexPath.row] objectForKey:@"Title"];
      NSInteger indentLevel = [[[mutableArray objectAtIndex:indexPath.row] objectForKey:@"Level"] intValue];
  
      [cell.textLabel setAttributedText:[self attributeString:labelString indentLevel:indentLevel]];
  
  return cell;
  
  }
  </code></pre>
  
  <p>Everything is working properly, But Xcode shows me this: </p>
  
  <pre class="lang-none prettyprint-override"><code>Unsupported configuration prototype table cells must have reuse identifiers
  </code></pre>
  
  <p>What did I miss? Can I get some help?</p>