spreadsheet excel writer ошибки

require_once 'Spreadsheet/Excel/Writer.php';

 

// Creating a workbook

$workbook = new Spreadsheet_Excel_Writer();

 

// sending HTTP headers

$workbook->send('test.xls');

 

// Creating a worksheet

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

 

// The actual data

$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);

 

// Let's send the file

$workbook->close();