Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /home/flighto/e-commerce/vendor/sylius/theme-bundle/src/DependencyInjection/SyliusThemeExtension.php:24 Stack trace: #0 {main} thrown in /home/flighto/e-commerce/vendor/sylius/theme-bundle/src/DependencyInjection/SyliusThemeExtension.php on line 24