title: PHPExcel - PDF convert doesn't work
body: <p>I am trying to open .xls file, edit it via PHPExcel and save as .pdf. I have got this source code:</p>
  
  <pre><code>&lt;?php   
  set_include_path('Classes/');
  require_once 'PHPExcel/IOFactory.php';
  require_once 'PHPExcel.php';
  $objPHPExcel = new PHPExcel();
  $objReader = new PHPExcel_Reader_Excel5();
  $objPHPExcel = $objReader-&gt;load('document.xls');
  $rowIterator = $objPHPExcel-&gt;getActiveSheet()-&gt;getRowIterator();
  $sheet = $objPHPExcel-&gt;getActiveSheet();
  $sheet-&gt;setCellValue('A1', 'řčřč');
  $sheet-&gt;setCellValue('B1', 'B');
  $sheet-&gt;setCellValue('C1', 'C');
  $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'PDF');
  $objWriter-&gt;save('document.pdf');
  ?&gt;
  </code></pre>
  
  <p>But it gives me this error</p>
  
  <blockquote>
    <p>Uncaught exception 'PHPExcel_Writer_Exception' with message 'PDF
    Rendering library has not been defined.' in
    /data/web/virtuals/55146/virtual/www/faktury/Classes/PHPExcel/Writer/PDF.php:56
    Stack trace: #0
    /data/web/virtuals/55146/virtual/www/faktury/Classes/PHPExcel/IOFactory.php(141):
    PHPExcel_Writer_PDF->__construct(Object(PHPExcel)) #1
    /data/web/virtuals/55146/virtual/www/faktury/faktura.php(29):
    PHPExcel_IOFactory::createWriter(Object(PHPExcel), 'PDF') #2 {main}
    thrown in
    /data/web/virtuals/55146/virtual/www/faktury/Classes/PHPExcel/Writer/PDF.php
    on line 56</p>
  </blockquote>
  
  <p>My PHP program is located in the same folder as Classes folder.</p>
  
  <p>Have you got someone any idea?</p>
  
  <p>Thank you very much.</p>