Fatal error: Uncaught Error: Class 'Concrete\Controller\Backend\UserInterface\File' not found in /home/gmcguire/public_html/concrete5/concrete/controllers/dialog/file/thumbnails.php:7 Stack trace: #0 {main} thrown in /home/gmcguire/public_html/concrete5/concrete/controllers/dialog/file/thumbnails.php on line 7