Fatal error: Uncaught Error: Class 'yii\bootstrap4\Widget' not found in /var/www/up.arbitr-dolg.ru/vendor/yiisoft/yii2-bootstrap4/src/NavBar.php:39 Stack trace: #0 {main} thrown in /var/www/up.arbitr-dolg.ru/vendor/yiisoft/yii2-bootstrap4/src/NavBar.php on line 39