Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Fragment\AbstractSurrogateFragmentRenderer' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/Fragment/SsiFragmentRenderer.php:19 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/Fragment/SsiFragmentRenderer.php on line 19