Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /home/technoon/public_html/demo/yondy/vendor/symfony/dependency-injection/Extension/AbstractExtension.php:25 Stack trace: #0 {main} thrown in /home/technoon/public_html/demo/yondy/vendor/symfony/dependency-injection/Extension/AbstractExtension.php on line 25