Fatal error: Uncaught Error: Class "Illuminate\Database\Eloquent\Relations\BelongsToMany" not found in D:\Proyectos\Facturas\vendor\illuminate\database\Eloquent\Relations\MorphToMany.php:9 Stack trace: #0 {main} thrown in D:\Proyectos\Facturas\vendor\illuminate\database\Eloquent\Relations\MorphToMany.php on line 9