Fix classname

DependencyInjection/Configuration.php

@@ -33,8 +33,8 @@ class Configuration implements ConfigurationInterface
                 ->arrayNode('class')
                     ->addDefaultsIfNotSet()
                     ->children()
-                        ->scalarNode('group')->defaultValue('Application\\Sonata\\UserBundle\\Entity\\User')->end()
-                        ->scalarNode('user')->defaultValue('Application\\Sonata\\UserBundle\\Entity\\Group')->end()
+                        ->scalarNode('group')->defaultValue('Application\\Sonata\\UserBundle\\Entity\\Group')->end()
+                        ->scalarNode('user')->defaultValue('Application\\Sonata\\UserBundle\\Entity\\User')->end()
                     ->end()
                 ->end()
             ->end()