ติด error notice trying to get property of non-object in...ของการ Call web service ค่ะ

Private Function getMemberExists(ByVal strMemCitizenID As String) As Boolean
        Dim bolStatus As Boolean = False
        Dim dt As DataTable
dt = ad.searchMemberAll(String.Empty, String.Empty, String.Empty, String.Empty, strMemCitizenID, String.Empty, String.Empty, String.Empty, String.Empty, String.Empty, String.Empty, Session("UserId")).Tables("TbReturn")

        If dt.Rows.Count > 0 Then //กรณีตรวจพบสมาชิกมีในฐานข้อมูลแล้ว
            bolStatus = True
        End If

        Return bolStatus
End Function

function checkMemberAll($memberID,$EntryMemID,$MemberCode,$EmpID,$cardid,$MemFname,$MemSname,$FullName,$InvID,$UnitID,$FundNo,$UserId) {
	
	
	
	$reClient = new SoapClient("http://..../..../....?WSDL");
	$reParams = array();
	$reParams['strMemberID'] = "";
	$reParams['strEntryMemID'] = "";
	$reParams['strMemberCode'] = "";
	$reParams['strEmpID'] = "";
	$reParams['strMemCitizenID'] = $cardid;
	$reParams['strMemFName'] = "";
	$reParams['strMemSName'] = "";
	$reParams['strFullName'] = "";
	$reParams['strInvID'] = "";
	$reParams['strUnitID'] = "";
	$reParams['strFundNo'] = "";
	$reParams['strUserId'] = "";
	
	$reParams = array('strMemberID' => $memberID,'strEntryMemID' => $EntryMemID,'strMemberCode' => $MemberCode,'strEmpID' => $EmpID,'strMemCitizenID' => $cardid,'strMemFname' => $MemFname,'strMemSname' =>$MemSname,'strFullName' => $FullName,
					'strInvID' => $InvID,'strUnitID' => $UnitID,'strFundNo' => $FundNo,'strUserId' => $UserId);
					
	//$reParams['strMemCitizenID'] = $cardid;
	
	//echo $reParams ;
	
	$resultid = $reClient->searchMemberAll($reParams);


	$xml_str_id = $resultid->searchMemberAllResult->any;
	
	
			$reDom = new DOMDocument;
			$reDom->loadXML($xml_str_id);
			$rid = simplexml_import_dom($reDom);

				
			$MemCitizenID = $rid->NewDataSet->TbReturn[0]->MemCitizenID;
	
			
			if($MemCitizenID === ""){
				return "";
			} else {
				return $MemCitizenID;
			}
			
		
	
}


$ChkMember = checkMemberAll($memberID,$EntryMemID,$MemberCode,$EmpID,$cardid,$MemFname,$MemSname,$FullName,$InvID,$UnitID,$FundNo,$UserId);

if($ChkMember  == ""){
       echo "No member";
}
else{
       echo "You're Member";
}