ckfinder error: 'Uncaught TypeError: Cannot read property 'extractHereLabel' of undefined'

I'm stuck on trying to figure out the below JS error whenever I load ckfinder:

'Uncaught TypeError: Cannot read property 'extractHereLabel' of undefined'

I've tried to debug by uncommenting error_reporting(E_ALL) and ini_set('display_errors', in the config.php file, and also adding 'config.logStackTrace = true;' to the config.js file. However, I'm not seeing any useful errors that are pointing me in the right direction.

The only 'weird' configuration I have going on is with the baseUrl config var. It's setup using a$_COOKIE['uploader'] variable: $baseUrl = '/uploads/' . $_COOKIE['uploader'] . '/';. I set it up this way so ckfinder creates a unique folder for each user if one does not already exist. I've tried hardcoding the full URL and full path of my uploads directory - but that still hasn't resolved the error. Also, my uploads directory permission is set at 777 (not secure, I know, but want to rule out any issues with permissions).

I'm at a loss at what to do next.