لدي مشكلة في قراءة البيانات القادمة من API

يظهر الخطأ:

Error: Expected a value of type 'int', but got one of type 'String'

void UpdateUI() async{
    FetchData fetchdata = FetchData('http://syy.pythonanywhere.com/loog/driii/');
    var profiledata = (await fetchdata.getdata());
    print(profiledata);
    name = profiledata['name'];
    code = profiledata['code'];
    birthday = profiledata['bd'];
    sex = profiledata['sex'];
    nationality = profiledata['nationality'];
    nationalnum = profiledata['nationalnum'];
    balance = double.parse(profiledata['baalance']);
    carNum =  profiledata['carnum'];
    photo = profiledata['photo'];


    print('done');


    setState(
          () {
            isDataReady = true;
      },
    );
  }