Fatal error: Uncaught Error: Class "Symfony\Component\Security\Acl\Permission\AbstractMaskBuilder" not found in /home/appvanshi/public_html/admin_panel/vendor/symfony/security-acl/Permission/MaskBuilder.php:45 Stack trace: #0 {main} thrown in /home/appvanshi/public_html/admin_panel/vendor/symfony/security-acl/Permission/MaskBuilder.php on line 45