Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface' not found in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\CacheWarmer\CacheWarmerAggregate.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\CacheWarmer\CacheWarmerAggregate.php on line 21