隔几天就出现这样的提示，重启下服务器就好了，大神帮看看哪里错误，

[baikujingling]

错误提示：

2014-11-24 18:39:22,996ERROR[app.yunduan@4]A0001:未知错误,请查看相应代码和日志<br>
at /include/frontcommon.inc.php:92<br>
at /include/rFunction.php:78($pdo->query())<br>
at /include/frontcommon.inc.php:92(rGetSiteConfig())<br>
at /theme/tejia/core/ListGoods.php:3("./../../../include/frontcommon.inc.php")<br>
at /theme/tejia/view/index.php:8("./../core/ListGoods.php")<br>
:com.caucho.quercus.lib.db.PDO.query: Error,ctx:

---------------------------------------------------------------------------------------------------

frontcommon.inc.php 90--97 行代码如下：

//全局系统设置参数

$res = rGetSiteConfig();
$siteName = $res['siteName'];//站点名称
$siteUrl = $res['siteUrl'];//站点地址
$sitewangwang = $res['wangwang'];// 	客服旺旺
$sitebangpai = $res['bangpai'];// 	站点帮派
$sitelogo = $res['logo'];// 	LOGO地址
$sitetupian = $res['tupian'];
$sitetupian1 = $res['tupian1'];
$sitetupian2 = $res['tupian2'];
$sitetupian3 = $res['tupian3'];

------------------------------------------------------------------------------------------------
rFunction.php 68--90 代码如下

/**
 * 获取站点配置信息
 * @global type $pdo
 * @return type 
 */
function rGetSiteConfig()
{
    global $pdo;
    $res = array();
    $sql = 'SELECT `value`, `alias` FROM site_config';
    if (!$result = $pdo->query($sql))
    {
        $sql_info = $pdo->errorInfo(); //取得错误信息数组(注意此处取的是$pdo的errorInfo而不是$sql的)
        echo '错误：' . $sql_info[2]; //输出错误信息
    }
    else
    {
        foreach ($pdo->query($sql) as $row)
        {
            $res[$row['alias']] = $row['value'];
        }

        return $res;
    }
}

-------------------------------------------------------------------------------------------------------------------------

ListGoods.php 代码如下



------------------------------------------------------------------------------------------------------------------------

index.php 代码如下






请问怎么修改下才好，现在是隔几天就出现错误。必须重启服务器才可以

[码无边]

:com.caucho.quercus.lib.db.PDO.query: Error,ctx: