更新

app/Admin/Controllers/UserController.php

@@ -12,6 +12,7 @@ use Dcat\Admin\Form;
 use Dcat\Admin\Grid;
 use Dcat\Admin\Http\Controllers\AdminController;
 use Dcat\Admin\Show;
+use Dcat\Admin\FormStep\Form as StepForm;
 
 class UserController extends AdminController
 {