Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /var/www/html/_old/vendor/azbuco/yii2-user/migrations/m200914_105500_add_key_to_access_token.php:5 Stack trace: #0 {main} thrown in /var/www/html/_old/vendor/azbuco/yii2-user/migrations/m200914_105500_add_key_to_access_token.php on line 5