Fatal error: Uncaught Error: Interface 'Illuminate\Contracts\Database\Eloquent\Builder' not found in E:\xampp\htdocs\www\yunwei\qr251\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\Relation.php:17 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\yunwei\qr251\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\Relation.php on line 17