Fatal error: Uncaught Error: Class 'Illuminate\Database\Eloquent\Model' not found in C:\xampp\htdocs\finance\vendor\kalnoy\nestedset\tests\models\DuplicateCategory.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\finance\vendor\kalnoy\nestedset\tests\models\DuplicateCategory.php on line 3