Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/live/hr-witty/vendor/kartik-v/yii2-dynagrid/src/migrations/m140101_100000_dynagrid.php:19 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/vendor/kartik-v/yii2-dynagrid/src/migrations/m140101_100000_dynagrid.php on line 19