Fatal error: Uncaught Error: Interface "Symfony\Component\DependencyInjection\Extension\ExtensionInterface" not found in /home/trpdev/public_html/vendor/symfony/dependency-injection/Tests/Fixtures/includes/ProjectExtension.php:6 Stack trace: #0 {main} thrown in /home/trpdev/public_html/vendor/symfony/dependency-injection/Tests/Fixtures/includes/ProjectExtension.php on line 6