Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /users/quirl/www/filemanager/spark/protected/humhub/migrations/m210204_054203_fix_settings_unique_index.php:9 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/migrations/m210204_054203_fix_settings_unique_index.php on line 9