Laravel - ErrorException : Array to string conversion

guys, I have a problem in this code in Laravel when using php artisan route:list

    ErrorException  : Array to string conversion

  at /var/www/html/app/Http/Controllers/Merchant/CountryAreaController.php:312
    308|             }
    309|         }
    310|         if (!empty($request->rental_service)) {
    311|             $service[] = 2;
  > 312|             foreach ($request->get('rental_vehicle_type' . []) as $item) {
    313|                 $area->VehicleType()->attach($item, ['service_type_id' => 2]);
    314|             }
    315|             $area->Package()->attach($request->rental_service, ['service_type_id' => 2]);
    316|         }

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