Fatal error: Uncaught Error: Interface "Magento\Framework\Event\ObserverInterface" not found in /var/www/magento/html/app/code/MagicToolbox/MagicZoomPlus/Observer/FixLayoutBefore.php:9 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/MagicToolbox/MagicZoomPlus/Observer/FixLayoutBefore.php on line 9