Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\HttpKernel" not found in E:\xampp\htdocs\key1\vendor\symfony\http-kernel\Tests\HttpCache\TestHttpKernel.php:22 Stack trace: #0 {main} thrown in E:\xampp\htdocs\key1\vendor\symfony\http-kernel\Tests\HttpCache\TestHttpKernel.php on line 22