Use ErrorElement from CoreBundle namespace

Admin/AdminInterface.php

@@ -18,7 +18,7 @@ use Sonata\AdminBundle\Datagrid\ProxyQueryInterface;
 use Sonata\AdminBundle\Security\Handler\SecurityHandlerInterface;
 use Sonata\AdminBundle\Builder\RouteBuilderInterface;
 use Sonata\AdminBundle\Translator\LabelTranslatorStrategyInterface;
-use Sonata\AdminBundle\Validator\ErrorElement;
+use Sonata\CoreBundle\Validator\ErrorElement;
 use Sonata\AdminBundle\Route\RouteGeneratorInterface;
 use Knp\Menu\FactoryInterface as MenuFactoryInterface;
 use Sonata\CoreBundle\Model\Metadata;