- Проверяем BaseForm

common/modules/school/controllers/CourseController.php

@@ -70,7 +70,7 @@ class CourseController extends FrontendController
 
         return $this->render('index', ['dataProvider' => $dataProvider, 
             /*'formPopup' => $formPopup->out, 'formLoginPopup' => $formLoginPopup->out*/
-            'form' => $form->out
+            'formModel' => $modelUser
         ]);
     }
     

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

@@ -107,7 +107,7 @@ WidgetAssetBundle::register($this);
                     <?php
                     $f = ActiveForm::begin(['id' => 'sh_reg_form', 'options' => ['enctype' => 'multipart/form-data']]);
 
-                    echo $f->field($form, 'name')->textInput(['placeholder'=>"Ваше имя*", 'class'=>'input_st field-input required alphanumeric'])->label(false);
+                    echo $f->field($formModel, 'name')->textInput(['placeholder'=>"Ваше имя*", 'class'=>'input_st field-input required alphanumeric'])->label(false);
 
                     ActiveForm::end();
                     ?>