今まで、長期に渡り使用していた所、突然ログインできなくなりました。
下記のようなエラーメッセージが出ており、解決策が分からずに困っています。
どのようにしたら、再度ログイン出来るようになるのでしょうか？

宜しくお願い致します。

システム：
ec-cube 2.4.1
postgre 8.1.10
php 5.2.4

以下、エラーメッセージ
________________________________________________________
http://www.○○○○○.com/admin/home.php?transactionid=7651b132ca42961b9b5d88bd024fd83ad8211a17

SERVER_ADDR:hoge.hoge.hoge.hoge
REMOTE_ADDR:hoge.hoge.hoge.hoge
USER_AGENT:Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 GTB6 (.NET CLR 3.5.30729)

SELECT
ord.order_id,
ord.customer_id,
ord.order_name01 AS name01,
ord.order_name02 AS name02,
ord.total,
ord.create_date,
(SELECT
det.product_name
FROM
dtb_order_detail AS det
WHERE
ord.order_id = det.order_id LIMIT 1
) AS product_name,
(SELECT
pay.payment_method
FROM
dtb_payment AS pay
WHERE
ord.payment_id = pay.payment_id
) AS payment_method
FROM (
SELECT
order_id,
customer_id,
order_name01,
order_name02,
total,
create_date,
payment_id
FROM
dtb_order AS ord
WHERE
del_flg = 0 AND status <> 3
ORDER BY
create_date DESC LIMIT 10 OFFSET 0
) AS ord
DB Error: unknown error

SELECT
ord.order_id,
ord.customer_id,
ord.order_name01 AS name01,
ord.order_name02 AS name02,
ord.total,
ord.create_date,
(SELECT
det.product_name
FROM
dtb_order_detail AS det
WHERE
ord.order_id = det.order_id LIMIT 1
) AS product_name,
(SELECT
pay.payment_method
FROM
dtb_payment AS pay
WHERE
ord.payment_id = pay.payment_id
) AS payment_method
FROM (
SELECT
order_id,
customer_id,
order_name01,
order_name02,
total,
create_date,
payment_id
FROM
dtb_order AS ord
WHERE
del_flg = 0 AND status <> 3
ORDER BY
create_date DESC LIMIT 10 OFFSET 0
) AS ord [nativecode=ERROR: more than one row returned by a subquery used as an expression]

/virtual/△△△/public_html/www.○○○○○.com/admin/home.php 33:LC_Page_Admin_Home_Ex->process
/virtual/△△△/public_html/www.○○○○○.com/data/class_extends/page_extends/admin/LC_Page_Admin_Home_Ex.php 56:LC_Page_Admin_Home->process
/virtual/△△△/public_html/www.○○○○○.com/data/class/pages/admin/LC_Page_Admin_Home.php 99:LC_Page_Admin_Home->lfGetNewOrder
/virtual/△△△/public_html/www.○○○○○.com/data/class/pages/admin/LC_Page_Admin_Home.php 245:SC_Query->getall
/virtual/△△△/public_html/www.○○○○○.com/data/class/SC_Query.php 156:SC_DbConn->getAll
/virtual/△△△/public_html/www.○○○○○.com/data/class/SC_DbConn.php 162:DB_common->getAll
/virtual/△△△/public_html/www.○○○○○.com/data/module/DB/common.php 1613:DB_common->query
/virtual/△△△/public_html/www.○○○○○.com/data/module/DB/common.php 1167:DB_pgsql->simpleQuery
/virtual/△△△/public_html/www.○○○○○.com/data/module/DB/pgsql.php 338:DB_pgsql->pgsqlRaiseError
/virtual/△△△/public_html/www.○○○○○.com/data/module/DB/pgsql.php 786:DB_common->raiseError
/virtual/△△△/public_html/www.○○○○○.com/data/module/DB/common.php 1853:PEAR->raiseError
/virtual/△△△/public_html/www.○○○○○.com/data/module/PEAR.php 557:DB_Error->DB_Error
/virtual/△△△/public_html/www.○○○○○.com/data/module/DB.php 893:PEAR_Error->PEAR_Error