php to excel error ไม่สามารถเรียกคุณสมบัติ SaveAs ของคลาส Workbook ได้

<?
include "config.php";

	$periodget = $_POST["txtperiod"];

	$datenowex = explode("-", date('Y-m-d'));
	$datenowexday = $datenowex[2];
	$datenowexmonth = $datenowex[1];
	$datenowexyear = $datenowex[0]+543;

	$datenowok = $datenowexyear.'-'.$datenowexmonth.'-'.$datenowexday;

	$datewant = date('Y-m-d', strtotime("-$periodget months"));
	$datewantex = explode("-", $datewant);
	$datewantexday = $datewantex[2];
	$datewantexmonth = $datewantex[1];
	$datewantexyear = $datewantex[0]+543;

	$datewantok = $datewantexyear.'-'.$datewantexmonth.'-'.$datewantexday;

	//echo $datenowok.' '.$datewantok;
	date_default_timezone_set('Asia/Bangkok');
	
	$sql="SELECT * FROM member
WHERE memname<>'' and memaddno<>'' and memtourlast BETWEEN '$datewantok' and '$datenowok' order by memlet asc";
	$query=mysql_query($sql);
	$num=mysql_num_rows($query);
	if($num<>0){
		//*** Get Document Path ***//
				$strPath = realpath(basename(getenv($_SERVER["SCRIPT_NAME"]))); // C:/AppServ/www/myphp

				//*** Excel Document Root ***//
				$strFileName = "Myxls/รายชื่อสมาชิกชมรมกอล์ฟสิงห์ระยอง ".date("Y-m-d").".xls";
				//echo $strFileName;

				//*** Connect to Excel.Application ***//
				$xlApp = new COM("Excel.Application");
				$xlBook = $xlApp->Workbooks->Add();


				//*** Create Sheet 1 ***//
				$xlBook->Worksheets(1)->Name = "Listmember";					
				$xlBook->Worksheets(1)->Select;

				//*** Header ***//
				$xlApp->ActiveSheet->Cells(1,1)->Value = "รหัส";
				$xlApp->ActiveSheet->Cells(1,2)->Value = "ชื่อสมาชิก";
				$xlApp->ActiveSheet->Cells(1,3)->Value = "นามสกุล";
				$xlApp->ActiveSheet->Cells(1,4)->Value = "";
				$xlApp->ActiveSheet->Cells(1,5)->Value = "รหัสไปรษณีย์";
				$xlApp->ActiveSheet->Cells(1,6)->Value = "เบอร์ติดต่อ";
				//***********//
			
				$intRows = 2;
	
		while($rs=mysql_fetch_array($query)){
			//echo"<tr>";

				$memlet = $rs[memlet];

				$memnum = $rs[memnum];
				$memname = $rs[memname];
				$memlname = $rs[memlname];

				$memaddno = $rs[memaddno];
				$memroad = $rs[memroad];
				$memtum = $rs[memtum];
				$memaum = $rs[memaum];
				$memprovince = $rs[memprovince];
				$mempost = $rs[mempost];
				$memaddfull = $memaddno.' ถ.'.$memroad.' ต.'.$memtum.' อ.'.$memaum.' จ.'.$memprovince;

				$memtel = $rs[memtel];
				//*** Detail ***//
					$xlApp->ActiveSheet->Cells($intRows,1)->Value = $memlet;
					$xlApp->ActiveSheet->Cells($intRows,2)->Value = $memnum.' '.$memname;
					$xlApp->ActiveSheet->Cells($intRows,3)->Value = $memlname;
					$xlApp->ActiveSheet->Cells($intRows,4)->Value = $memaddfull;
					$xlApp->ActiveSheet->Cells($intRows,5)->Value = $mempost;
					$xlApp->ActiveSheet->Cells($intRows,6)->Value = $memtel;
					$intRows++;
				?>

				<!-- <td align='center' width='100'><font style='font-size: 18px;'><?echo $memlet;?></td>
				<td><font style='font-size: 14px;'><?echo $memnum.' '.$memname;?></td>
				<td><font style='font-size: 14px;'><?echo $memlname;?></td>
				<td><font style='font-size: 14px;'><?echo $memaddfull;?></td>
				<td align='center'><font style='font-size: 14px;'><?echo $mempost;?></td>
				<td><font style='font-size: 14px;'><?echo $memtel;?></td> -->

				<?
		}
				@unlink($strFileName); //*** Delete old files ***//	

				$xlBook->SaveAs($strPath."/".$strFileName); //*** Save to Path ***//
				//$xlBook->SaveAs(realpath($strFileName)); //*** Save to Path ***//

				//*** Close & Quit ***//
				$xlApp->Application->Quit();
				$xlApp = null;
				$xlBook = null;
				$xlSheet1 = null;
				//echo"</table>";
}
	mysql_close();
?>