request is working in post

how to send same request in flutter using Dio package
have tried

    formData = FormData.fromMap({
      "mobileRequest": {
        "companyRequest": {
          "companyId": 1,
          "serviceName": "service1",
          "serviceDescription": "service1",
          "serviceContactInfo": "+201001656577,+20100987654",
          "serviceCategoryId": 1
        }
      },
    });
    for (var file in filePathes) {
      formData.files.addAll([
        MapEntry(
          "files",
          await MultipartFile.fromFile(
            file,
            filename: file.split('/').last,
          ),
        ),
      ]);
    }

but response is 500 internal server error
and also tried

 List<MultipartFile> filesList2 = serviceEntiti.images!
        .map((e) => MultipartFile.fromFileSync(e.path))
        .toList();
  formData = FormData.fromMap({
      "mobileRequest": {
        "companyRequest": {
          "companyId": 1,
          "serviceName": "service1",
          "serviceDescription": "service1",
          "serviceContactInfo": "+201001656577,+20100987654",
          "serviceCategoryId": 1
        }
      },
      "files": filesList2,
    });

but also get the same response 500 internal server error