EC-CUBE は 2.4.3
DBサーバ PostgreSQL 7.4.29
PHP 5.2.13
でWadaxのレンタルサーバー（共有）を使っています。
エラーの内容は下記です。
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Fatal error: Call to undefined method SC_Helper_CSV_Ex::lfGetCategoryCSV() in /home/******/public_html/data/class_extends/page_extends/admin/products/LC_Page_Admin_Products_Category_Ex.php on line 198
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LC_Page_Admin_Products_Category_Ex.phpの中身は下記です。
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<?php
/*
* This file is part of EC-CUBE
*
* Copyright(c) 2000-2007 LOCKON CO.,LTD. All Rights Reserved.
*
* http://www.lockon.co.jp/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

// {{{ requires
require_once(CLASS_PATH . "pages/admin/products/LC_Page_Admin_Products_Category.php");

/**
* カテゴリ管理 のページクラス(拡張).
*
* LC_Page_Admin_Products_Category をカスタマイズする場合はこのクラスを編集する.
*
* @package Page
* @author LOCKON CO.,LTD.
* @version $Id: LC_Page_Admin_Products_Category_Ex.php 16741 2007-11-08 00:43:24Z adachi $
*/
class LC_Page_Admin_Products_Category_Ex extends LC_Page_Admin_Products_Category {

// }}}
// {{{ functions

/**
* Page を初期化する.
*
* @return void
*/
function init() {
parent::init();
}

/**
* Page のプロセス.
*
* @return void
*/
function process() {
//parent::process();

$conn = new SC_DBConn();
$objView = new SC_AdminView();
$objSess = new SC_Session();
$objDb = new SC_Helper_DB_Ex();

// 認証可否の判定
SC_Utils_Ex::sfIsSuccess($objSess);

// パラメータ管理クラス
$this->objFormParam = new SC_FormParam();
// パラメータ情報の初期化
$this->lfInitParam();
// POST値の取得
$this->objFormParam->setParam($_POST);

// 通常時は親カテゴリを0に設定する。
$this->arrForm['parent_category_id'] =
isset($_POST['parent_category_id']) ? $_POST['parent_category_id'] : "";

if (!isset($_POST['mode'])) $_POST['mode'] = "";

switch($_POST['mode']) {
case 'edit':
$this->objFormParam->convParam();
$arrRet = $this->objFormParam->getHashArray();
$this->arrErr = $this->lfCheckError($arrRet);

if(count($this->arrErr) == 0) {
if($_POST['category_id'] == "") {
$objQuery = new SC_Query();
$count = $objQuery->count("dtb_category");
if($count < CATEGORY_MAX) {
$this->lfInsertCat($_POST['parent_category_id']);
} else {
print("カテゴリの登録最大数を超えました。");
}
} else {
$this->lfUpdateCat($_POST['category_id']);
}
} else {
$this->arrForm = array_merge($this->arrForm, $this->objFormParam->getHashArray());
$this->arrForm['category_id'] = $_POST['category_id'];
}
break;
case 'pre_edit':
// 編集項目のカテゴリ名をDBより取得する。
//$oquery = new SC_Query();
$objQuery = new SC_Query();

$where = "category_id = ?";
//$cat_name = $oquery->get("dtb_category", "category_name", $where, array($_POST['category_id']));
$col = "category_name, category_info, info_flg, level";
$arrRet = $objQuery->select($col, "dtb_category", $where, array($_POST['category_id']));

// 入力項目にカテゴリ名を入力する。
//$this->arrForm['category_name'] = $cat_name;
$this->arrForm['category_name'] = $arrRet[0]['category_name'];
$this->arrForm['category_info'] = $arrRet[0]['category_info'];
$this->arrForm['info_flg'] = $arrRet[0]['info_flg'];
$this->arrForm['level'] = $arrRet[0]['level'];
// POSTデータを引き継ぐ
$this->arrForm['category_id'] = $_POST['category_id'];
break;
case 'delete':
$objQuery = new SC_Query();
// 子カテゴリのチェック
$where = "parent_category_id = ? AND del_flg = 0";
$count = $objQuery->count("dtb_category", $where, array($_POST['category_id']));
if($count != 0) {
$this->arrErr['category_name'] = "※ 子カテゴリが存在するため削除できません。<br>";
}
// 登録商品のチェック
$table = "dtb_product_categories AS T1 LEFT JOIN dtb_products AS T2 ON T1.product_id = T2.product_id";
$where = "T1.category_id = ? AND T2.del_flg = 0";
$count = $objQuery->count($table, $where, array($_POST['category_id']));
if($count != 0) {
$this->arrErr['category_name'] = "※ カテゴリ内に商品が存在するため削除できません。<br>";
}

if(!isset($this->arrErr['category_name'])) {
// ランク付きレコードの削除(※処理負荷を考慮してレコードごと削除する。)
$objDb->sfDeleteRankRecord("dtb_category", "category_id", $_POST['category_id'], "", true);
}
break;
case 'up':
$objQuery = new SC_Query();
$objQuery->begin();
$up_id = $this->lfGetUpRankID($objQuery, "dtb_category", "parent_category_id", "category_id", $_POST['category_id']);
if($up_id != "") {
// 上のグループのrankから減算する数
$my_count = $this->lfCountChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $_POST['category_id']);
// 自分のグループのrankに加算する数
$up_count = $this->lfCountChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $up_id);
if($my_count > 0 && $up_count > 0) {
// 自分のグループに加算
$this->lfUpRankChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $_POST['category_id'], $up_count);
// 上のグループから減算
$this->lfDownRankChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $up_id, $my_count);
}
}
$objQuery->commit();
break;
case 'down':
$objQuery = new SC_Query();
$objQuery->begin();
$down_id = $this->lfGetDownRankID($objQuery, "dtb_category", "parent_category_id", "category_id", $_POST['category_id']);
if($down_id != "") {
// 下のグループのrankに加算する数
$my_count = $this->lfCountChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $_POST['category_id']);
// 自分のグループのrankから減算する数
$down_count = $this->lfCountChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $down_id);
if($my_count > 0 && $down_count > 0) {
// 自分のグループから減算
$this->lfUpRankChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $down_id, $my_count);
// 下のグループに加算
$this->lfDownRankChilds($objQuery, "dtb_category", "parent_category_id", "category_id", $_POST['category_id'], $down_count);
}
}
$objQuery->commit();
break;
case 'tree':
break;
case 'csv':
require_once(CLASS_EX_PATH . "helper_extends/SC_Helper_CSV_Ex.php");

$objCSV = new SC_Helper_CSV_Ex();
// オプションの指定
$option = "ORDER BY rank DESC";
// CSV出力タイトル行の作成
$arrOutput = SC_Utils_Ex::sfSwapArray($objCSV->sfgetCsvOutput(5, " WHERE csv_id = 5 AND status = 1"));

if (count($arrOutput) <= 0) break;

$arrOutputCols = $arrOutput['col'];
$arrOutputTitle = $arrOutput['disp_name'];

$head = SC_Utils_Ex::sfGetCSVList($arrOutputTitle);

$where = "del_flg = 0";
$data = $objCSV->lfGetCategoryCSV($where, $option, $arrval, $arrOutputCols);

// CSVを送信する。
SC_Utils_Ex::sfCSVDownload($head.$data, 'category');
exit;
break;
default:
$this->arrForm['parent_category_id'] = 0;
break;
}

$this->arrList = $this->lfGetCat($this->arrForm['parent_category_id']);
$this->arrTree = $objDb->sfGetCatTree($this->arrForm['parent_category_id']);

$objView->assignobj($this);
$objView->display(MAIN_FRAME);
}

/**
* デストラクタ.
*
* @return void
*/
function destroy() {
parent::destroy();
}


// カテゴリの新規追加
function lfInsertCat($parent_category_id) {

$objQuery = new SC_Query();
$objQuery->begin(); // トランザクションの開始


if($parent_category_id == 0) {
// ROOT階層で最大のランクを取得する。
$where = "parent_category_id = ?";
$rank = $objQuery->max("dtb_category", "rank", $where, array($parent_category_id)) + 1;
} else {
// 親のランクを自分のランクとする。
$where = "category_id = ?";
$rank = $objQuery->get("dtb_category", "rank", $where, array($parent_category_id));
// 追加レコードのランク以上のレコードを一つあげる。
$sqlup = "UPDATE dtb_category SET rank = (rank + 1) WHERE rank >= ?";
$objQuery->exec($sqlup, array($rank));
}

$where = "category_id = ?";
// 自分のレベルを取得する(親のレベル + 1)
$level = $objQuery->get("dtb_category", "level", $where, array($parent_category_id)) + 1;

// 入力データを渡す。
$sqlval = $this->objFormParam->getHashArray();
$sqlval['create_date'] = "Now()";
$sqlval['update_date'] = "Now()";
$sqlval['creator_id'] = $_SESSION['member_id'];
$sqlval['parent_category_id'] = $parent_category_id;
$sqlval['rank'] = $rank;
$sqlval['level'] = $level;

//追記:親の設定を引き継ぐ時
if($sqlval['info_flg']) {
$sqlval['category_info'] = $this->lfGetParentInfo($objQuery, $parent_category_id);
}

// INSERTの実行
$objQuery->insert("dtb_category", $sqlval);

$objQuery->commit(); // トランザクションの終了
}


// カテゴリの編集
function lfUpdateCat($category_id) {
$objQuery = new SC_Query();
// 入力データを渡す。
$sqlval = $this->objFormParam->getHashArray();
$sqlval['update_date'] = "Now()";
$where = "category_id = ?";

//追記:親の設定を引き継ぐ時
if($sqlval['info_flg']) {
$parent_category_id = $objQuery->get("dtb_category", "parent_category_id", $where, array($category_id));
$sqlval['category_info'] = $this->lfGetParentInfo($objQuery, $parent_category_id);
}

$objQuery->update("dtb_category", $sqlval, $where, array($category_id));
}


/* パラメータ情報の初期化 */
function lfInitParam() {
$this->objFormParam->addParam("カテゴリ名", "category_name", STEXT_LEN, "KVa", array("EXIST_CHECK","SPTAB_CHECK","MAX_LENGTH_CHECK"));
$this->objFormParam->addParam("カテゴリ説明", "category_info", LLTEXT_LEN, "KVa", array("SPTAB_CHECK","MAX_LENGTH_CHECK"));
$this->objFormParam->addParam("親カテゴリ説明のコピー", "info_flg", INT_LEN, "n", array("MAX_LENGTH_CHECK", "NUM_CHECK"));
}


// 追記:親のcategory_infoを取得する
function lfGetParentInfo($objQuery, $pid) {
$where = "category_id = ?";
$parent_info = $objQuery->get("dtb_category", "category_info", $where, array($pid));
return $parent_info;
}
}
?>
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コードを何度も調べましたが、原因が分かりません。
教えて頂けると助かります。