Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /home/flighto/e-commerce/vendor/sylius/theme-bundle/tests/Application/TestBundle/DependencyInjection/TestExtension.php:21 Stack trace: #0 {main} thrown in /home/flighto/e-commerce/vendor/sylius/theme-bundle/tests/Application/TestBundle/DependencyInjection/TestExtension.php on line 21