Hello All,
I have just installed K2 and was testing everything when I came accross an error when trying to add a new Category. The error is:

Warning: require_once(/home/theworl0/public_html/judge/administrator/components/com_finder/helpers/indexer/adapter.php) [function.require-once]: failed to open stream: No such file or directory in /home/theworl0/public_html/judge/plugins/finder/k2/k2.php on line 15

Fatal error: require_once() [function.require]: Failed opening required '/home/theworl0/public_html/judge/administrator/components/com_finder/helpers/indexer/adapter.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/theworl0/public_html/judge/plugins/finder/k2/k2.php on line 15

Any help on this would be greatly appreciated.
Thanks!

Backup your site first (akeeba)
then reinstall k2 over the top
after reinstalling, check the information tab and be sure mb_encoding is turned on, on your server