มีปัญหากับการใช้งาน PHPExcel กับฐานข้อมมูล Oracel 10g

$objReader = PHPExcel_IOFactory::createReader('Excel5');
$objReader->setReadDataOnly(true);
$objPHPExcel = $objReader->load('asset_report-2.xls');
$objPHPExcel->getDefaultStyle()->getFont()->setName('Arial');
$objPHPExcel->getDefaultStyle()->getFont()->setSize(11); 

# Properties xlsx document 
$objPHPExcel->getProperties()->setCreator("tummavong")
							 ->setLastModifiedBy("IT")
							 ->setTitle("report")
							 ->setSubject("report")
							 ->setDescription("Report asset control system")
							 ->setKeywords("xlsl")
							 ->setCategory("Report");
							 
$objPHPExcel->getActiveSheet()->setTitle('Asset');
$objPHPExcel->getActiveSheet()->getPageSetup()->setOrientation(PHPExcel_Worksheet_PageSetup::ORIENTATION_LANDSCAPE);

$Sheet = $objPHPExcel->getActiveSheet();
$j = (int)2 ;
for($i = 0; $i<=$count; $i++){
	$Sheet->setCellValue('A'.$j,$result['ASS_NO'][$i]);
	$Sheet->getStyle('A'.$j)->getNumberFormat()->setFormatCode('000000');
	$Sheet->getStyle('A'.$j)->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
	$Sheet->setCellValue('B'.$j,$result['PO_NO'][$i]);
	$Sheet->getStyle('B'.$j)->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
	$Sheet->setCellValue('C'.$j,$result['DATE_REQ'][$i]);
	$Sheet->getStyle('C'.$j)->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
	$Sheet->setCellValue('D'.$j,$result['MODEL'][$i]);
	$Sheet->setCellValue('E'.$j,$result['SERVICE_TAG'][$i]);
	$Sheet->getStyle('E'.$j)->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
	$Sheet->setCellValue('F'.$j,$result['PRICE'][$i]);
	$Sheet->getStyle('F'.$j)->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_RIGHT);
	$Sheet->getStyle('F'.$j)->getNumberFormat()->setFormatCode('#,##0.00');
	$Sheet->setCellValue('G'.$j,iconv("TIS-620","UTF-8",$result['USR_REQ'][$i]));
	$Sheet->setCellValue('H'.$j,iconv("UTF-8","TIS-620",$result['USR_REQ'][$i]));
	$Sheet->setCellValue('I'.$j,$result['USR_REQ'][$i]);
	$Sheet->setCellValue('J'.$j,"ภาษาไทย");
	$j++;
}

header('Content-Type: application/vnd.ms-excel;charset=tis-620');
header('Content-Disposition: attachment;filename="asset_10report.xls"');
header('Cache-Control: max-age=0');

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save('php://output');
exit;