*/
        public function getConfigTreeBuilder() {
                //Set tree builder
-               $treeBuilder = new TreeBuilder();
+               $treeBuilder = new TreeBuilder('parameters');
 
                //The bundle default values
                $defaults = [
                //Here we define the parameters that are allowed to configure the bundle.
                $treeBuilder
                        //Parameters
-                       ->root('parameters')
+                       ->getRootNode()
                                ->addDefaultsIfNotSet()
                                ->children()
                                        ->arrayNode('rapsys_user')