Fatal error: Uncaught Error: Class "Illuminate\Database\Eloquent\Relations\Relation" not found in C:\xampp\htdocs\elitecourtesans-yedek\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\BelongsToMany.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\elitecourtesans-yedek\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\BelongsToMany.php on line 18