Fatal error: Uncaught Error: Class 'Concrete\Core\Board\Command\BoardSlotCommandHandler' not found in /home/gmcguire/public_html/concrete5/concrete/src/Board/Command/AddCustomSlotToBoardCommandHandler.php:7 Stack trace: #0 {main} thrown in /home/gmcguire/public_html/concrete5/concrete/src/Board/Command/AddCustomSlotToBoardCommandHandler.php on line 7