Rows doesn't get reponse data

[arzukara]

Hi,

I'm getting data from API like I wrote down.

 Future<String> getDataTableProvider(context) async {
    final response = await http.post(Uri.parse('https://**/DENEME.php'), body: {'tablename': 'TABLENAME'});

     rows = json.decode(response.body);
    print(rows);
    print("Data download successfully");
    return Future.value("Data download successfully");
  }

But Editable rows don't accept that row variable, turns rows as null. When I copy print of rows (print(rows);) and use it to define rows like;

rows = [
    {
      "name": 'James LongName Joe',
      "date": '23/09/2020',
      "month": 'June',
      "status": 'completed'
    },
    {
      "name": 'Daniel Paul',
      "month": 'March',
      "status": 'new',
      "date": '12/4/2020',
    },
    {
      "month": 'May',
      "name": 'Mark Zuckerberg',
      "date": '09/4/1993',
      "status": 'expert'
    },
    {
      "name": 'Jack',
      "status": 'legend',
      "date": '01/7/1820',
      "month": 'December',
    },
  ];

It works. I can get the same data with the same format when I use "json.decode(response.body)" but it doesn't work.
Why it could be?
(rows variable defined as List. And response has a right shape which package example requires.)