Flutter int类型不是double类型的子类型

我的Flutter 翼应用程序有这个问题.它似乎无法加载API请求，但当我在浏览器上try 时，它返回了OK"http://vplay.id/api/series/popular".

Debug

exception = {_Exception} Exception: Failed to load
message = "Failed to load"
this = {SeriesProvider} 
 _url = "http://vplay.id/api/"
 _loading = false
 _currentPage = 1
 _pages = 1
 _series = {_GrowableList} size = 0
 _seriesStream = {_AsyncStreamController} 
endpoint = "series/popular"
e = {_TypeError} type 'int' is not a subtype of type 'double'
 _stackTrace = {_StackTrace} 
 _failedAssertion = "is assignable"
 _url = "package:streamapp/src//helpers/parse.dart"
 _line = 31
 _column = 7
 message = "type 'int' is not a subtype of type 'double'"

Series_provider.dart

import 'dart:async';
import 'dart:convert';

import 'package:http/http.dart' as http;
import '../helpers/api.dart';
import '../models/serie_model.dart';
export '../models/serie_model.dart';

class SeriesProvider {
  String _url = Api.url;
  bool _loading = false;
  int _currentPage = 1;
  int _pages = 1;
  List<Serie> _series = List();
  final _seriesStream = StreamController<List<Serie>>();

  Function(List<Serie>) get seriesSink => _seriesStream.sink.add;
  Stream<List<Serie>> get seriesStream => _seriesStream.stream;

  void dispose() {
    _seriesStream?.close();
  }

  Future<List<Serie>> _process(String endpoint) async {
    try {
      final resp = await http.get(_url + endpoint);

      if (resp.statusCode != 200) {
        throw Exception('Failed to load');
      }

      final data = json.decode(resp.body);

      final series = Series.fromJsonList(data);

      return series.items;
    } catch (e) {
      throw Exception('Failed to load');
    }
  }

Helpers/parse.dart

static double checkDouble(dynamic value) {
    if (value is String) {
      return double.parse(value);
    } else {
      return value;
    }
  }
}

这是我第一次使用Ffltter，这很有趣，因为只有我才会面对这个问题(这是我从CodeCanyon Marketplace获得的一个应用程序)，而且是全新安装的.