Fatal Error when clicking Apply Config

Queues module seems broken, when I click on any existing queue, I get a page that is blank except for a list of queues. Clicking on any of them just reloads the same page.

When I click "Apply Config" at the top, I get the following error:
{{exit: 255
found language dir en_UK for broadcast, not installed on system, skipping
found language dir fr for directory, not installed on system, skipping
found language dir en_UK for pagingpro, not installed on system, skipping
found language dir ja for pbdirectory, not installed on system, skipping
found language dir es for pbdirectory, not installed on system, skipping
found language dir es for speeddial, not installed on system, skipping
PHP Fatal error: Cannot use object of type DB_Error as array in /var/www/html/admin/modules/queues/functions.inc/geters_seters.php on line 330}}