致命错误：未捕获的PHPExcel_Writer_Exception：未定义PDF呈现库

Question

<?php
require_once "Classes/PHPExcel.php";
if(require ('Classes/PHPExcel/Settings.php')) {
    echo 'well imported<br/>';
} else {
    echo 'not imported<br>';
}
//require ('Classes/PHPExcel/Writer/PDF/DomPDF.php');
require ('Classes/DomPDF/Dompdf.php');
require_once ('Classes/PHPExcel/IOFactory.php');
include_once ('Classes/PHPExcel/Writer/Excel2007.php');
include_once ('Classes/PHPExcel/Writer/PDF.php');
$rendererName = PHPExcel_Settings::PDF_RENDERER_DOMPDF;
$rendererLibrary = 'domPDF0.6.0beta3';
//$rendererLibraryPath = dirname(__FILE__). 'libs/classes/dompdf' . $rendererLibrary;
$rendererLibraryPath = dirname(__FILE__). 'libs/classes/dompdf' . $rendererLibrary;

        $tmpfname = "Ctest.xlsx";
        $excelReader = PHPExcel_IOFactory::createReaderForFile($tmpfname);
        $excelObj = $excelReader->load($tmpfname);
        $worksheet = $excelObj->getSheet(0);
        $lastRow = $worksheet->getHighestRow();

        echo "<table>";
        for ($row = 1; $row <= $lastRow; $row++) {
             echo "<tr><td>";
             echo $worksheet->getCell('A'.$row)->getValue();
             echo "</td><td>";
             echo $worksheet->getCell('B'.$row)->getValue();
             echo "</td><tr>";
        }
        echo "</table>";    
        $objPHPExcel = new PHPExcel(); 
        $objPHPExcel->getActiveSheet()->setTitle('Orari');
        $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'PDF');
        $objWriter->setSheetIndex(0);
        $objWriter->save('Ctest.pdf');
?>

  

致命错误：未捕获PHPExcel_Writer_Exception：PDF渲染库   尚未定义。在   /opt/lampp/htdocs/PHPExcelTestExportPDF/Classes/PHPExcel/Writer/PDF.php:48   堆栈跟踪：＃0   /opt/lampp/htdocs/PHPExcelTestExportPDF/Classes/PHPExcel/IOFactory.php(139）：   PHPExcel_Writer_PDF-> __ construct（Object（PHPExcel））＃1   /opt/lampp/htdocs/PHPExcelTestExportPDF/phpexc.php(35）：   PHPExcel_IOFactory :: createWriter（Object（PHPExcel），'PDF'）＃2 {main}   扔进去   /opt/lampp/htdocs/PHPExcelTestExportPDF/Classes/PHPExcel/Writer/PDF.php   在第48行