Fatal error: Uncaught Error: Class 'yii\base\Widget' not found in /mnt/www/fss/service-center/vendor/kartik-v/yii2-krajee-base/src/Widget.php:20 Stack trace: #0 {main} thrown in /mnt/www/fss/service-center/vendor/kartik-v/yii2-krajee-base/src/Widget.php on line 20