Fatal error: Uncaught Error: Class "Concrete\Core\Foundation\Command\Command" not found in /home/elcrestweb/public_html/concrete/src/Board/Designer/Command/ScheduleCustomElementCommand.php:10 Stack trace: #0 {main} thrown in /home/elcrestweb/public_html/concrete/src/Board/Designer/Command/ScheduleCustomElementCommand.php on line 10