Fatal error: Uncaught Error: Interface "Symfony\Component\Security\Core\Role\RoleHierarchyInterface" not found in /home/ldt/public_html/canvas/udoit/vendor/symfony/security-core/Role/RoleHierarchy.php:19 Stack trace: #0 {main} thrown in /home/ldt/public_html/canvas/udoit/vendor/symfony/security-core/Role/RoleHierarchy.php on line 19