- Подключили cases во фронтенд

frontend/config/main.php

@@ -15,6 +15,7 @@ return [
     'defaultRoute' => 'content/page/view',
     'modules' => [
         'content' => ['class' => 'common\modules\content\Module',],
+        'cases' => ['class' => 'common\modules\cases\Module'],
         'reviews' => ['class' => 'common\modules\reviews\Module',],
         'request' => ['class' => 'common\modules\request\Module',],
 	    'faq' => ['class' => 'common\modules\faq\Module'],