Another day, another problem 🙂
Just install new component and after try change options I got:
JDatabaseMySQLi::query: 1054 - Unknown column 'alias' in 'where clause' SQL=SELECT id FROM j17_assets WHERE alias = 'root'
So I start digging… Solution is (as always) pretty simple just run in your Joomla database:
UPDATE `xxx_assets` SET `parent_id` = '1' WHERE `parent_id` = '0' AND `id` != 1;
Of course xxx is your tables prefix.
Error reason? Something with ACL… but if solution works… no time to more digging….