Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /var/www/html/vendor/yiisoft/yii2/caching/migrations/m150909_153426_cache_init.php:19 Stack trace: #0 {main} thrown in /var/www/html/vendor/yiisoft/yii2/caching/migrations/m150909_153426_cache_init.php on line 19