安装了用不了已解决悬赏5积分

安装了后无法登陆，一直报这个错：

08:53:25 ERROR: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO) in /opt/zbox/app/zentao/framework/base/router.class.php on line 1883, last called by /opt/zbox/app/zentao/framework/base/router.class.php on line 1841 through function connectByPDO.
in /opt/zbox/app/zentao/framework/base/router.class.php on line 1932 when visiting