DedeCMS Error Warning!

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Error page: /
Error infos: 无法使用数据库

if(!file_exists(dirname(__FILE__).'/data/common.inc.php')) { header('Location:install/index.php'); exit(); } require_once (dirname(__FILE__) . "/include/common.inc.php"); require_once DEDEINC."/arc.partview.class.php"; $GLOBALS['_arclistEnv'] = 'index'; $row = $dsql->GetOne("Select * From `dede_homepageset`"); $row['templet'] = MfTemplet($row['templet']); $pv = new PartView(); $pv->SetTemplet($cfg_basedir . $cfg_templets_dir . "/" . $row['templet']); $pv->Display(); ?>