Fatal error: Uncaught Error: Interface "Magento\Framework\Event\ObserverInterface" not found in /home/www/staging1.gamanorteweb.com/app/code/Magefan/Blog/Observer/InvalidateCache.php:18 Stack trace: #0 {main} thrown in /home/www/staging1.gamanorteweb.com/app/code/Magefan/Blog/Observer/InvalidateCache.php on line 18