- Проверяем вывод формы

common/modules/school/views/course/index.php

@@ -133,7 +133,7 @@ WidgetAssetBundle::register($this);
         <div id="registration_form" class="popup registration_form">
             <span class="popup__title2">Регистрация</span>
             <?php
-            $form = ActiveForm::widget(['id' => 'reg_form_popup', 'options' => ['enctype' => 'multipart/form-data', 'class' =>'validreg_form2']]);
+            $form = ActiveForm::begin(['id' => 'reg_form_popup', 'options' => ['enctype' => 'multipart/form-data', 'class' =>'validreg_form2']]);
 
             echo Html::a(Html::tag('div', 'Начать обучение', ['class' => 'save-button popup_bt_send save-button-lg']), 'javascript:void(0)', ['class'=>"save-button popup_bt_send save-button-lg"]);