มึนกับ on a non-object in ... ไม่เข้าใจเป็นเพราะอะไรคับ

$rs = $db->Execute("SELECT * FROM guestbook_test2 WHERE id=? OR id=?", array($select_id,$select_id2));

<?
	require("header.lib.php");
	$tpl=new FastTemplate(".");
	$tpl->define(array(template=>'schools.html',schools_row=>'schools_row.html'));

	$conditions=NULL;
	$keyword = trim($keyword); 

	if(!empty($keyword)){
	$conditions="AND (name LIKE '%$keyword%' OR detail LIKE '%$keyword%' OR address LIKE  '%$keyword%')";
}
	$tpl->assign(array(VAR_KEYWORD => $keyword));
	 $tpl->assign(array(VAR_SHOW_ROW=> NULL)); // โชว์ข้อความ

	$itemNo=1;	
		$tpl->assign(array(VAR_SCHOOLSLIST_ROW=>NULL));    //ปิดไม่ให้มันแสดง VAR_SCHOOLSLIST_ROW
		$sql= "select * from school  $conditions ORDER BY name ASC";   
		$rs= $ado->Execute($sql) or die ("Error");
		$numRows= $rs->RecordCount();
		$tpl->assign(array(VAR_NUM_ROWS=>$numRows));

	if ($numRows> 0) {  
		while ($Schoollist= $rs->FetchNextObject()){								//$SchoolObject เราตั้งขึ้น
			$bgcolor=(($itemNo%2)== 0 )?"#c9aed9":"#E5E5E5";							 //  สีตารางสลับกัน
			$tpl->assign(array(VAR_BGCOLOR =>$bgcolor));
			$tpl->assign(array(VAR_ITEM_NO=>$itemNo++));	
			$tpl->assign(array(VAR_ID =>$Schoollist->ID));	
			$name=stripslashes($Schoollist->NAME);
			$name= ReplaceKeyword(stripslashes($Schoollist->NAME),$keyword);       //คำค้นมีแถมสี			
			$tpl->assign(array(VAR_NAME=>($Schoollist->NAME)));

			$tpl->parse(VAR_SCHOOLSLIST_ROW,".schools_row");
}
		}
	else{ 
		$tpl->assign(array(VAR_SHOW_ROW => "<tr><td align='center' style=' height:235px; padding:0px; color:red; font: bold 24px Tahoma;'>** ไม่พบข้อมูล... </td></tr>"));
}
if($ado) $ado->close();

$tpl-> parse(TEMPLATE,"template");
$tpl->FastPrint(TEMPLATE);
?>