_TypeError (type 'int' is not a subtype of type 'double' in type cast)

Future<void> _fetchChartData() async {
    final response = await http.get(Uri.parse(
        'https://finnhub.io/api/v1/stock/candle?symbol=${widget.symbol}&resolution=${widget.resolution}&from=${widget.fewDaysAgoTimestamp}&to=${widget.currentTimestamp}&token=$apiKey'));

    if (response.statusCode == 200) {
      final data = json.decode(response.body);
      final List<_ChartData> newChartData = [];

      final List<double> values = List.castFrom(data['c']);
      final List<int> timestamps = List.castFrom(data['t']);

      for (int i = 0; i < values.length; i++) {
        final DateTime date =
            DateTime.fromMillisecondsSinceEpoch(timestamps[i] * 1000);
        var randomValue = values[i];
        newChartData.add(
          _ChartData(date, randomValue),
        );

        if (i == 0) {
          _maxValue = _minValue = randomValue.toInt();
        } else {
          _maxValue = max(_maxValue, randomValue.toInt());
          _minValue = min(_minValue, randomValue.toInt());
        }
      }

      setState(() {
        _chartData = newChartData;
        _isGoingUp = _chartData.first.y <= _chartData.last.y;
      });
    }
  }

'''
var randomValue = values[i];
'''
In this line i am getting error like "_TypeError (type 'int' is not a subtype of type 'double' in type cast)"

In initstate api call is done but shows this error So can you help me to find error and what's wrong in my code

In Dart, the term "cast" means treating an object as a different type. It does not apply any kind of transformation to that object.

You have:

final data = json.decode(response.body);
...
final List<double> values = List.castFrom(data['c']);

If data contains ints and not doubles, then List<double>.castFrom will not help you, and you will end up with a TypeError when you try to access an int element. You instead should explicitly convert the elements to doubles. For example:

final List<double> values = [for (var n in data['c'] ?? []) n.toDouble()];

or:

final List<double> values = data['c']?.map((n) => n.toDouble()).toList();