Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/user/migrations/m180315_112748_fix_email_length.php:11 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/user/migrations/m180315_112748_fix_email_length.php on line 11