Fatal error: Uncaught Error: Interface "Symfony\Component\HttpKernel\HttpKernelInterface" not found in /home/www/drupal8/test/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php:12 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php on line 12