Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /var/www/html/vendor/yiisoft/yii2/log/migrations/m141106_185632_log_init.php:23 Stack trace: #0 {main} thrown in /var/www/html/vendor/yiisoft/yii2/log/migrations/m141106_185632_log_init.php on line 23