Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpKernel\KernelInterface' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\http-kernel\Kernel.php:58 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\http-kernel\Kernel.php on line 58