title: PHPExcel save error - Cell coordinate string can not be a range of cells
body: <p>
  I am currently trying to save an excel file loaded with PHPExcel. The template file has multiple sheets that reference other sheets in formulas. The template is being loaded from my local Apache server. After loading the file I try to save it and it throws an exception "Cell coordinate string can not be a range of cells". Using the HTML writer it displays perfectly.</p>
  
  <p>Here is my code: </p>
  
  
  
  <pre><code>require_once "assets/vendors/PHPExcel/PHPExcel.php";
  require_once 'assets/vendors/PHPExcel/PHPExcel/IOFactory.php';
  $tmpfname = 'template_files/templateFile.xlsx';
  
  $objReader = PHPExcel_IOFactory::createReaderForFile($tmpfname);
  $objPHPExcel = $objReader-&gt;load($tmpfname);
  
  try {
      $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
      header("Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
      header('Content-Disposition: attachment;filename="myfile.xlsx"');
      header('Cache-Control: max-age=0');
      $objWriter-&gt;save('php://output');  
  
  } catch (Exception $e) {
          echo 'Caught exception: ',  $e-&gt;getMessage(), "\n";
  }
  </code></pre>
  
  <p>
  I expected my template sheet to be downloaded as usual in PHPExcel but cannot solve this issue. Has anyone else run into something similar? </p>
  
  <p>
  The document that is downloaded is completely blank with the exception printed "Caught exception: Cell coordinate string can not be a range of cells".</p>