Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Encoder\DecoderInterface" not found in /var/www/crm_killing_ninja/core/backend/MediaObjects/Services/MultipartDecoder.php:33 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/core/backend/MediaObjects/Services/MultipartDecoder.php on line 33