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