retrieving data from hive gives type cast error in flutter

Question

I am trying to get the weight data from hive using flutter, however, i am getting a below error:

type 'double' is not a subtype of type 'UserDataModel'

My user data is :

@HiveType(typeId: 2)
class UserDataModel extends HiveObject {
@HiveField(0)
final String lifestyle;
@HiveField(1)
final String sex;
@HiveField(2)
final String photoData;
@HiveField(3)
final int age;
@HiveField(4)
final int height;
@HiveField(5)
final double weight; plus consturctor & adapter.

I am trying to display an amount by calling a userBox:

  body: SafeArea(
    child: ListView.builder(
      itemCount: hiveBox.length,
      itemBuilder: (BuildContext context, int index) {
        ExerciseBox data = hiveBox.getAt(index);
        UserDataModel datas = userBox.getAt(index);
        return Container(
          child: InkWell(
            onTap: () {
              
                        },
                      ),
                      CupertinoActionSheetAction(
                        child: 
   Text(Languages.of(context)!.deleteWorkout),
                        onPressed: () {
                          setState(() {
                            hiveBox.deleteAt(index);
                          });
                          Navigator.pop(context);
                        },
                      )
                    ],
                  ),
                );
              } else {
                showModalBottomSheet(
                  context: context,
                  builder: (context) {
                    return Column(
                      mainAxisSize: MainAxisSize.min,
                      children: <Widget>[
                        ListTile(
                          title: Text(
                            data.date.year.toString() +
                                "/" +
                                data.date.month.toString() +
                                '/' +
                                data.date.day.toString() +
                                ' ' +
                                data.date.hour.toString() +
                                ":" +
                                data.date.minute.toString(),
                            style: const TextStyle(
                                color: Colors.black,
                                fontSize: 15,
                                fontWeight: FontWeight.w500),
                          ),
                        ),
                        ListTile(
                          //leading: new Icon(Icons.photo),
                          title: 
  Text(Languages.of(context)!.useThisSettings),
                          onTap: () {
                            if (hiveBox.getAt(index).isCustom == true) 
  {
                              ScaffoldMessenger.of(context)
                                ..removeCurrentSnackBar()
                                ..showSnackBar(SnackBar(
                                    content: 
   Text(Languages.of(context)!.settingsNoUse)));
                            } else {
                              setState(() {
                                int duration = data.exerciseTime *
                                    data.numberExercise *
                                    data.numberRepetitions +
                                    data.restTime *
                                        data.numberRepetitions *
                                        (data.numberExercise - 1) +
                                    data.changeRepTime *
                                        (data.numberRepetitions - 1);
                                MinutesTotal = (duration ~/ 60)
                                    .toString()
                                    .padLeft(2, '0');
                                SecondsTotal = (duration % 60)
                                    .toString()
                                    .padLeft(2, '0');
                                BurnedCalories = 
   (datas.weight*4.5*0.0175*int.parse(MinutesTotal))
   .toString().padLeft(2, '0');
                              hiveBox.put('burnedCalories', 
    int.parse(BurnedCalories));
                              });
                            }
                            Navigator.pop(context);
                          },
                        ),
                    );
                  },
                );
              }
            },

how to retrieve the data from the box? As u can see I am using 2 different box data, that should not be a problem, right? I am just learning flutter and very new to hive. help appreciated very much! Thanks!