Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Serializer' not found in /var/www/html/navirre.com/htdocs/concrete/src/Foundation/Serializer/JsonSerializer.php:7 Stack trace: #0 {main} thrown in /var/www/html/navirre.com/htdocs/concrete/src/Foundation/Serializer/JsonSerializer.php on line 7