Fatal error: Uncaught Error: Class "Drupal\Core\Entity\Plugin\Validation\Constraint\CompositeConstraintBase" not found in /home/qcsvlel/www/core/modules/menu_link_content/src/Plugin/Validation/Constraint/MenuTreeHierarchyConstraint.php:16 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/menu_link_content/src/Plugin/Validation/Constraint/MenuTreeHierarchyConstraint.php on line 16