无法加载源'dart：convert / runtime / libconvert_patch.dart'：<source not =“” available =“” />

Question

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我无法摆脱这个错误

Future<List<Widget>> getTeamPages(String idLeague) async {
    var data = await http.get(
        "https://www.thesportsdb.com/api/v1/json/1/lookup_all_teams.php?id=$idLeague");


    List<Widget> listTeamPages = [];

    var jsonData = json.decode(data.body);

    for (var s in jsonData["teams"]) {