报错：Save failed with the following error: Access denied for user

第一次使用joomla，添加文章时，报错如下：

Save failed with the following error: Access denied for user 'user'@'localhost' to database 'jm_33' SQL=LOCK TABLES `x9pei_assets` WRITE

出现上面错误，一般就是权限的问题，就是user没有lock的权限。