Fatal error: Uncaught Error: Class 'Illuminate\Database\Eloquent\Relations\Relation' not found in C:\xampp\htdocs\webservices\2911inovarservice-order\vendor\illuminate\database\Eloquent\Relations\BelongsToMany.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\webservices\2911inovarservice-order\vendor\illuminate\database\Eloquent\Relations\BelongsToMany.php on line 16