Fatal error: Uncaught Error: Interface 'Symfony\Component\Cache\Marshaller\MarshallerInterface' not found in /mnt/volume_lon1_01/backend/adminseppi/vendor/symfony/http-foundation/Session/Storage/Handler/IdentityMarshaller.php:19 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/adminseppi/vendor/symfony/http-foundation/Session/Storage/Handler/IdentityMarshaller.php on line 19