ERROR: SQLSTATE  Access denied for user 'root'@'localhost' (using password: NO)
It's a fresh install from coomit #7ec1289. I am expecting the installation wizard, but greeted with the above error. Any idea?
In general it means that username/password for DB server are incorrect, or this user doesn't have permission for the chosen database. If you can give more details, like if this happens right after entering DB details, or later, this might be different.
You can edit
storage/config/db.php and fix the credentials, if you figure out that they were entered wrong.