Fatal error: Uncaught Error: Class 'yii\base\Widget' not found in /home/abertime/new.abertime.com.ua/vendor/yiisoft/yii2-bootstrap4/src/Widget.php:16 Stack trace: #0 {main} thrown in /home/abertime/new.abertime.com.ua/vendor/yiisoft/yii2-bootstrap4/src/Widget.php on line 16