Fatal error: Uncaught Error: Class 'Concrete\Core\File\Event\File' not found in /home/optinadmin/rfl.optin.co.nz/concrete/src/File/Event/DuplicateFile.php:4 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/src/File/Event/DuplicateFile.php on line 4