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