Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Serializer' not found in /home/rys/public_html/updates/concrete-cms-9.4.2-remote-updater/concrete/src/Foundation/Serializer/JsonSerializer.php:7 Stack trace: #0 {main} thrown in /home/rys/public_html/updates/concrete-cms-9.4.2-remote-updater/concrete/src/Foundation/Serializer/JsonSerializer.php on line 7