Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Validation\Rule" not found in /var/www/html/packages/Webkul/Admin/src/Validations/ProductCategoryUniqueSlug.php:11 Stack trace: #0 {main} thrown in /var/www/html/packages/Webkul/Admin/src/Validations/ProductCategoryUniqueSlug.php on line 11