Fatal error: Uncaught Error: Class "Symfony\Component\Config\Definition\Builder\NodeDefinition" not found in /home/marcgron/www/SSA/v2/vendor/symfony/config/Definition/Builder/ArrayNodeDefinition.php:28 Stack trace: #0 {main} thrown in /home/marcgron/www/SSA/v2/vendor/symfony/config/Definition/Builder/ArrayNodeDefinition.php on line 28