Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpKernel\KernelInterface' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/Kernel.php:56 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/Kernel.php on line 56