Fatal error: Uncaught Error: Interface "Symfony\Component\HttpKernel\HttpKernelInterface" not found in /home/www/drupal8/test/core/modules/page_cache/src/StackMiddleware/PageCache.php:20 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/page_cache/src/StackMiddleware/PageCache.php on line 20