DioError [DioErrorType.RESPONSE]: Http status error [500], why?

Question

I'm new to flutter, I use Dio in my project to make Members Register features.. but everytime I execute the register process, the Debug Console give me this error

I/flutter (13428): Instance of 'FormData'
I/flutter (13428): DioError [DioErrorType.RESPONSE]: Http status error [500]

however, when I tried to register with POSTMAN, It was a success. So I'm not sure where the problem is.. here's my code, could you guys please help me? i've been stuck on this for weeks..

final String url = "https://api.censored.org/api/members/register";

Dio.FormData formData = Dio.FormData.fromMap({
  "nama_lengkap": name,
  "tempat_lahir": tempatlahir,
  "tanggal_lahir": selectedDate.toString(),
  "email": email,
  "password": password,
  "username": username,
  "nomor_ktp": noKTP,
  "alamat_ktp": alamatktpmember,
  "alamat_domisili": alamatmember,
  "pekerjaan": pekerjaanmember,
  "alamat_pekerjaan": alamatperusahaanmember,
  "no_whatsapp": noWAmember,
  "no_hp": noteleponmember,
  "nama_pemilik_rekening": namarekmember,
  "nomor_rekening": norekmember,
  "bank_id": _valBank,
  "aggrement": _eulargprogramming,

  //Foto
  "foto_ktp": await Dio.MultipartFile.fromFile(_fotoKtp.path),
  "selfie_dengan_ktp": await Dio.MultipartFile.fromFile(_fotoSelfie.path),
  "foto_kk": await Dio.MultipartFile.fromFile(_fotoKK.path),
  "foto_pengenal_lainnya":
      await Dio.MultipartFile.fromFile(_fotoKartu.path),
  "foto_buku_rekening":
      await Dio.MultipartFile.fromFile(_fotoRekening.path),
  "foto_profil": await Dio.MultipartFile.fromFile(_fotoSelfie.path),

  //Array
  "penjamin": {
    "stakeholder_id": _subrgProgramming1,
    "nama": penjaminNama,
    "nomor_ktp": penjaminNoktp,
    "alamat_ktp": penjaminAlamat,
    "alamat_domisili": penjaminDomisili,
    "no_hp": notelppenjamin,
  },
  "sosial_media": [
    {
      "sosial_media_id": _sosmedrgprogramming,
      "nama": sosialmediamember,
      "screenshot": await Dio.MultipartFile.fromFile(_fotoSosmed.path),
    }
  ],
  "saudara_kerabat": [
    {
      "stakeholder_id": 4,
      "nama": namasaudara,
      "no_hp": notelpsaudara,
    },
    {
      "stakeholder_id": 5,
      "nama": namakerabat1,
      "no_hp": notelpkerabat1,
    },
    {
      "stakeholder_id": 5,
      "nama": namakerabat2,
      "no_hp": notelpkerabat2,
    },
    {
      "stakeholder_id": 5,
      "nama": namakerabat3,
      "no_hp": notelpkerabat3,
    }
  ],
});
print(formData);
var res;
try {
  Dio.Dio doo = Dio.Dio();
  doo.options.headers['Accept'] = 'application/json';
  doo.options.contentType = 'application/json';
  doo.options.followRedirects = false;
  Dio.Response response = await doo.post(url, data: formData);

  if (response.statusCode == 200) {
    print(response.data);
    res = response;
    final data = jsonDecode(res.body);
    print(res);

    int regvalue = data['value'];
    String message = data['message'];
    if (regvalue == 1) {
      setState(() {
        Navigator.pop(context);
      });
      print(message);
      registerToast(message);
    } else if (regvalue == 2) {
      print(message);
      registerToast(message);
    } else {
      print(message);
      registerToast(message);
    }
  }
} on Dio.DioError catch (e) {
  if (e.response.statusCode == 422) {
    print(e.response.data);
  }
} on Dio.DioError catch (e) {
  if (e.response.statusCode == 500) {
    print(e.response.data);
  }
}


}

  registerToast(String toast) {
    return Fluttertoast.showToast(
        msg: toast,
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.BOTTOM,
        timeInSecForIos: 1,
        backgroundColor: Colors.red,
        textColor: Colors.white);
  }

Answer 1

this means your sever responded with InternalServerError but dio sees this as an exception to fix this either use try and catch blocs or pass this to your dio instace

 final res = await dio.delete(
          url,
          data: postData,
          options: Options(

            followRedirects: false,
            // will not throw errors
            validateStatus: (status) => true,
            headers: headers,
          ),
        );