Fatal error: Uncaught Error: Class 'yii\web\Controller' not found in /var/www/up.tantal-metall.com/yii_up/modules/processor_post/controllers/MainController.php:16 Stack trace: #0 {main} thrown in /var/www/up.tantal-metall.com/yii_up/modules/processor_post/controllers/MainController.php on line 16