Fatal error: Uncaught Error: Interface "Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface" not found in /var/www/html/festival/vendor/symfony/http-kernel/CacheWarmer/CacheWarmer.php:19 Stack trace: #0 {main} thrown in /var/www/html/festival/vendor/symfony/http-kernel/CacheWarmer/CacheWarmer.php on line 19