diff --git a/src/DynamicFormWidget.php b/src/DynamicFormWidget.php
index f7c26f5..5a12cc4 100644
--- a/src/DynamicFormWidget.php
+++ b/src/DynamicFormWidget.php
@@ -68,7 +68,7 @@ class DynamicFormWidget extends \yii\base\Widget
     /**
      * @var string css class for primary key field. Must be added to input field
      */
-    public $pkKeyCss = '.pk-id-field';
+    public $pkKeyCss = 'pk-id-field';
     /**
      * @var string
      */
@@ -221,7 +221,9 @@ public function registerAssets($view)
         $js .= "});\n";
         $view->registerJs($js, $view::POS_READY);
 
-        $js = 'jQuery("#' . $this->formId . '").yiiDynamicForm(' . $this->_hashVar .');' . "\n";
+        $js = 'jQuery("#' . $this->formId . '").on("afterInit", function(e) {' . "\n";
+        $js .= '    jQuery("#' . $this->formId . '").yiiDynamicForm(' . $this->_hashVar .');' . "\n";
+        $js .= "});\n";
         $view->registerJs($js, $view::POS_LOAD);
     }
 
diff --git a/src/assets/yii2-dynamic-form.js b/src/assets/yii2-dynamic-form.js
index 5b47249..fd8530a 100644
--- a/src/assets/yii2-dynamic-form.js
+++ b/src/assets/yii2-dynamic-form.js
@@ -87,8 +87,17 @@
 
         // remove "error/success" css class
         var yiiActiveFormData = $('#' + widgetOptions.formId).yiiActiveForm('data');
-        $template.find('.' + yiiActiveFormData.settings.errorCssClass).removeClass(yiiActiveFormData.settings.errorCssClass);
-        $template.find('.' + yiiActiveFormData.settings.successCssClass).removeClass(yiiActiveFormData.settings.successCssClass);
+
+        var $errorCssClass = "has-error"; var $successCssClass = "has-success"; // init default yii class
+
+        // seek settings data only if object is not undefined.
+        if ( typeof yiiActiveFormData != 'undefined') {
+            $errorCssClass = yiiActiveFormData.settings.errorCssClass;
+            $successCssClass = yiiActiveFormData.settings.successCssClass;
+        }
+
+        $template.find('.' + $errorCssClass).removeClass($errorCssClass);
+        $template.find('.' + $successCssClass).removeClass($successCssClass);
 
         return $template;
     };