之前是可以用的，后来安装了mysql，又卸载了，就出现提示错误进不去了已解决悬赏7积分

ERROR: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES) in D:\xampp\zentao\framework\base\router.class.php on line 2164, last called by D:\xampp\zentao\framework\base\router.class.php on line 2115 through function connectByPDO.
in D:\xampp\zentao\framework\base\router.class.php on line 2215 when visiting