Your database prefix seams wrong. There's a dash in it for some reason. Why is your database table prefix set to prb-mnt? Navigate to your database and confirm the prefix then edit configuration.php and correct it as needed. This normally isn't a problem if a table name is surrounded by `, but looks like some of Joomlas queries aren't which will cause fatal SQL errors when there's a dash in the table name. If your table prefix is prb-mnt I recommend changing it to prb_mnt instead.