Fatal error: Uncaught Error: Class 'yii\base\Widget' not found in /mnt/www/fss/casefiling/vendor/yiisoft/yii2-bootstrap/src/Widget.php:17 Stack trace: #0 {main} thrown in /mnt/www/fss/casefiling/vendor/yiisoft/yii2-bootstrap/src/Widget.php on line 17