php error!!

Fatal error: Call-time pass-by-reference has been removed in C:\xampp\php\pear\Spreadsheet\Excel\Writer\Worksheet.php on line 2490

แก้อย่างไรครับ

โค้ด

<?php
require_once 'Spreadsheet/Excel/Writer.php';

// We give the path to our fil
$workbook = new Spreadsheet_Excel_Writer('test.xls');

$worksheet =& $workbook->addWorksheet('My first worksheet');

$worksheet->write(0, 0, 'Name');
$worksheet->write(0, 1, 'Age');
$worksheet->write(1, 0, 'John Smith');
$worksheet->write(1, 1, 30);
$worksheet->write(2, 0, 'Johann Schmidt');
$worksheet->write(2, 1, 31);
$worksheet->write(3, 0, 'Juan Herrera');
$worksheet->write(3, 1, 32);

// We still need to explicitly close the workbook
$workbook->close();
?>

รบกวนหน่อยครับ