Fatal error: Uncaught Error: Class 'Illuminate\Database\Eloquent\Relations\Relation' not found in D:\xampp\htdocs\psp\backend\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\BelongsToMany.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\BelongsToMany.php on line 17