Fatal error: Uncaught Error: Class "yii\base\Model" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/space/models/forms/InviteForm.php:23 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/space/models/forms/InviteForm.php on line 23