Fatal error: Uncaught Error: Class "yii\bootstrap4\Dropdown" not found in /var/www/html/prod/vendor/kartik-v/yii2-bootstrap4-dropdown/src/Dropdown.php:58 Stack trace: #0 {main} thrown in /var/www/html/prod/vendor/kartik-v/yii2-bootstrap4-dropdown/src/Dropdown.php on line 58