title: Flutter: FutureBuilder type 'FormatException' is not a subtype of type 'Widget'
body: <p>I'm doing a section that is related to the weather forecast.</p>
  
  <p>In his day I asked how to obtain data on a json list:
  <a href="https://stackoverflow.com/questions/50945526/flutter-get-data-from-a-list-of-json">Flutter: Get data from a list of json</a></p>
  
  <p>I think the error is in the json about ----> <strong>],</strong> 
  <br>
  <br>
  When I tried to show the data I get an error. I hope to solve this problem, I appreciate any help, thanks.</p>
  
  <p><strong>ScreenShot</strong>
  <a href="https://i.stack.imgur.com/QyXYd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QyXYd.png" alt="enter image description here"></a></p>
  
  <p><strong>JSON:</strong></p>
  
  <pre><code>{
    "metcheckData": {
      "forecastLocation": {
        "forecast": [
          {
            "temperature": "18",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4656",
            "uvIndex": "0",
            "totalcloud": "8",
            "lowcloud": "8",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "84",
            "windspeed": "9",
            "meansealevelpressure": "1018.02",
            "windgustspeed": "11",
            "winddirection": "28.7724",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "3",
            "weekday": "Tuesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-19T23:00:00.00"
          },
          {
            "temperature": "18",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4663",
            "uvIndex": "0",
            "totalcloud": "8",
            "lowcloud": "8",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "85",
            "windspeed": "9",
            "meansealevelpressure": "1018.26",
            "windgustspeed": "11",
            "winddirection": "29.4946",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T00:00:00.00"
          },
          {
            "temperature": "18",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4666",
            "uvIndex": "0",
            "totalcloud": "8",
            "lowcloud": "8",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "86",
            "windspeed": "9",
            "meansealevelpressure": "1018.18",
            "windgustspeed": "10",
            "winddirection": "30.0925",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T01:00:00.00"
          },
          {
            "temperature": "18",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4668",
            "uvIndex": "0",
            "totalcloud": "11",
            "lowcloud": "11",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "87",
            "windspeed": "8",
            "meansealevelpressure": "1017.79",
            "windgustspeed": "10",
            "winddirection": "30.761",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T02:00:00.00"
          },
          {
            "temperature": "17",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4671",
            "uvIndex": "0",
            "totalcloud": "12",
            "lowcloud": "12",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "87",
            "windspeed": "8",
            "meansealevelpressure": "1017.36",
            "windgustspeed": "9",
            "winddirection": "31.0844",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T03:00:00.00"
          },
          {
            "temperature": "17",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4673",
            "uvIndex": "0",
            "totalcloud": "11",
            "lowcloud": "11",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "88",
            "windspeed": "8",
            "meansealevelpressure": "1017.04",
            "windgustspeed": "9",
            "winddirection": "31.4161",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T04:00:00.00"
          },
          {
            "temperature": "17",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4671",
            "uvIndex": "0",
            "totalcloud": "11",
            "lowcloud": "11",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "89",
            "windspeed": "7",
            "meansealevelpressure": "1016.89",
            "windgustspeed": "9",
            "winddirection": "31.2326",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T05:00:00.00"
          },
          {
            "temperature": "17",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4668",
            "uvIndex": "0",
            "totalcloud": "10",
            "lowcloud": "10",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "91",
            "windspeed": "8",
            "meansealevelpressure": "1017.04",
            "windgustspeed": "9",
            "winddirection": "30.2947",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T06:00:00.00"
          },
          {
            "temperature": "17",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4664",
            "uvIndex": "0",
            "totalcloud": "9",
            "lowcloud": "9",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "92",
            "windspeed": "8",
            "meansealevelpressure": "1017.35",
            "windgustspeed": "10",
            "winddirection": "29.0404",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T07:00:00.00"
          },
          {
            "temperature": "17",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4664",
            "uvIndex": "0",
            "totalcloud": "16",
            "lowcloud": "16",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "91",
            "windspeed": "9",
            "meansealevelpressure": "1017.77",
            "windgustspeed": "10",
            "winddirection": "27.9231",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T08:00:00.00"
          },
          {
            "temperature": "18",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4673",
            "uvIndex": "1",
            "totalcloud": "32",
            "lowcloud": "32",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "86",
            "windspeed": "9",
            "meansealevelpressure": "1018.05",
            "windgustspeed": "11",
            "winddirection": "25.3295",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T09:00:00.00"
          },
          {
            "temperature": "18",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4687",
            "uvIndex": "2",
            "totalcloud": "38",
            "lowcloud": "38",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "82",
            "windspeed": "9",
            "meansealevelpressure": "1018.31",
            "windgustspeed": "10",
            "winddirection": "22.0118",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T10:00:00.00"
          },
          {
            "temperature": "19",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4702",
            "uvIndex": "3",
            "totalcloud": "36",
            "lowcloud": "36",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "76",
            "windspeed": "9",
            "meansealevelpressure": "1018.56",
            "windgustspeed": "10",
            "winddirection": "18.4385",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T11:00:00.00"
          },
          {
            "temperature": "20",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4712",
            "uvIndex": "4",
            "totalcloud": "31",
            "lowcloud": "31",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "72",
            "windspeed": "9",
            "meansealevelpressure": "1018.79",
            "windgustspeed": "9",
            "winddirection": "14.9684",
            "windletter": "NNE",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T12:00:00.00"
          },
          {
            "temperature": "20",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4722",
            "uvIndex": "5",
            "totalcloud": "26",
            "lowcloud": "26",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "69",
            "windspeed": "9",
            "meansealevelpressure": "1018.9",
            "windgustspeed": "8",
            "winddirection": "12.5729",
            "windletter": "W",
            "icon": "FA",
            "iconName": "Fair",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T13:00:00.00"
          },
          {
            "temperature": "21",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4739",
            "uvIndex": "10",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "68",
            "windspeed": "9",
            "meansealevelpressure": "1018.83",
            "windgustspeed": "8",
            "winddirection": "10.6461",
            "windletter": "N",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T14:00:00.00"
          },
          {
            "temperature": "21",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4765",
            "uvIndex": "10",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "67",
            "windspeed": "9",
            "meansealevelpressure": "1018.59",
            "windgustspeed": "8",
            "winddirection": "9.82178",
            "windletter": "N",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T15:00:00.00"
          },
          {
            "temperature": "21",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4797",
            "uvIndex": "10",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "67",
            "windspeed": "9",
            "meansealevelpressure": "1018.34",
            "windgustspeed": "8",
            "winddirection": "9.66212",
            "windletter": "N",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T16:00:00.00"
          },
          {
            "temperature": "21",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4826",
            "uvIndex": "9",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "68",
            "windspeed": "9",
            "meansealevelpressure": "1017.98",
            "windgustspeed": "8",
            "winddirection": "8.49407",
            "windletter": "N",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T17:00:00.00"
          },
          {
            "temperature": "20",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4844",
            "uvIndex": "9",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "70",
            "windspeed": "9",
            "meansealevelpressure": "1017.81",
            "windgustspeed": "9",
            "winddirection": "8.70691",
            "windletter": "N",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "D",
            "utcTime": "2018-06-20T18:00:00.00"
          },
          {
            "temperature": "20",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4857",
            "uvIndex": "8",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "72",
            "windspeed": "10",
            "meansealevelpressure": "1017.93",
            "windgustspeed": "10",
            "winddirection": "10.5324",
            "windletter": "N",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T19:00:00.00"
          },
          {
            "temperature": "19",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4872",
            "uvIndex": "2",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "74",
            "windspeed": "10",
            "meansealevelpressure": "1018.25",
            "windgustspeed": "11",
            "winddirection": "13.7294",
            "windletter": "NNE",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T20:00:00.00"
          },
          {
            "temperature": "19",
            "dewpoint": "15",
            "rain": "0",
            "freezinglevel": "4889",
            "uvIndex": "1",
            "totalcloud": "1",
            "lowcloud": "1",
            "medcloud": "0",
            "highcloud": "0",
            "humidity": "78",
            "windspeed": "11",
            "meansealevelpressure": "1018.64",
            "windgustspeed": "13",
            "winddirection": "17.2073",
            "windletter": "NNE",
            "icon": "SU",
            "iconName": "Sunny",
            "chanceofrain": "0",
            "chanceofsnow": "0",
            "dayOfWeek": "4",
            "weekday": "Wednesday",
            "sunrise": "6:57",
            "sunset": "19:04",
            "dayOrNight": "N",
            "utcTime": "2018-06-20T21:00:00.00"
          },
        ],
        "continent": "",
        "country": "",
        "location": "28.0/-15.6",
        "latitude": 28.0,
        "longitude": -15.6,
        "timezone": 1
      }
    },
    "feedCreation": "2018-06-19T23:05:19.00",
    "feedCreator": "Metcheck.com",
    "feedModel": "GHX2",
    "feedModelRun": "12Z",
    "feedModelRunInitialTime": "2018-06-19T12:00:00.00",
    "feedResolution": "0.01"
  }
  </code></pre>
  
  <p><strong>ViewWeather</strong> </p>
  
  <pre><code>import 'dart:async';
  import 'dart:convert';
  import 'package:http/http.dart' as http;
  import 'package:flutter/material.dart';
  
  class _ViewWeatherState extends State&lt;ViewWeather&gt; {
  
    Future&lt;List&lt;Post&gt;&gt; fetchPosts() async {
      http.Response response = await http.get('http://ws1.metcheck.com/ENGINE/v9_0/json.asp?lat=28&amp;lon=-15.6&amp;lid=62228&amp;Fc=No');
      var responseJson = json.decode(response.body);
      return (responseJson['metcheckData']['forecastLocation']['forecast'] as List).map((p) =&gt; Post.fromJson(p)).toList();
    }
  
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        appBar: new AppBar(
          title: new Text(widget.title),
          backgroundColor: Colors.blue[900],
          centerTitle: true,
        ),
        body: new Container(
          child: new ListView(
            children: &lt;Widget&gt;[
              new FutureBuilder&lt;List&lt;Post&gt;&gt;(
                future: fetchPosts(),
                builder: (context, snapshot) {
                  if (snapshot.hasData){
                    List&lt;Post&gt; posts = snapshot.data;
                    return new Column(
                        children: posts.map((post) =&gt; new Column(
                          children: &lt;Widget&gt;[
                            new Text(post.temperature),
                          ],
                        )).toList()
                    );
                  }
                  else if(snapshot.hasError)
                  {
                    return snapshot.error;
                  }
                  return new Center(
                    child: new Column(
                      children: &lt;Widget&gt;[
                        new Padding(padding: new EdgeInsets.all(50.0)),
                        new CircularProgressIndicator(),
                      ],
                    ),
                  );
                },
              ),
            ],
          )
        ),
      );
    }
  }
  </code></pre>
  
  <p><strong>Post</strong></p>
  
  <pre><code>class Post {
    final String temperature, rain, humidity, sunrise, sunset, updateDate;
  
    Post({
      this.temperature,
      this.rain,
      this.humidity,
      this.sunrise,
      this.sunset,
      this.updateDate,
    });
  
    factory Post.fromJson(Map&lt;String, dynamic&gt; json) {
      return new Post(
        temperature: json['temperature'] as String,
        rain: json['rain'] as String,
        humidity: json['humidity'] as String,
        sunrise: json['sunrise'] as String,
        sunset: json['sunset'] as String,
        updateDate: json['utcTime'] as String,
      );
    }
  }
  </code></pre>