Fatal error: Uncaught Error: Interface "Magento\Framework\Event\ObserverInterface" not found in /home/airtimer/public_html/app/code/Mageplaza/Core/Observer/PredispatchAdminActionControllerObserver.php:34 Stack trace: #0 {main} thrown in /home/airtimer/public_html/app/code/Mageplaza/Core/Observer/PredispatchAdminActionControllerObserver.php on line 34