Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Definition\Builder\NodeParentInterface" not found in /home/ldt/public_html/canvas/udoit/vendor/symfony/config/Definition/Builder/TreeBuilder.php:21 Stack trace: #0 {main} thrown in /home/ldt/public_html/canvas/udoit/vendor/symfony/config/Definition/Builder/TreeBuilder.php on line 21