Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /home/crmcineworld/public_html/vendor/mdmsoft/yii2-admin/migrations/m160312_050000_create_user.php:6 Stack trace: #0 {main} thrown in /home/crmcineworld/public_html/vendor/mdmsoft/yii2-admin/migrations/m160312_050000_create_user.php on line 6