我在Flutter中创建了一个postDetails页面，并编写了一个函数来列出该帖子的评论。它从数据库中正确提取数据（我正在调试），但FormatException（FormatException：意外字符（在char 1中）它给出错误。işte kodum;

Future<void> getComments() async {
  var url = Uri.parse("http://172.30.182.148/uploads/getComments.php");
  var response = await http.post(url, body: {"post_id": widget.id});

  if (response.statusCode == 200) {
    var data = jsonDecode(response.body);
    setState(() {
      comments = List<String>.from(data['comment']);
    });
  } else {
    Fluttertoast.showToast(msg: "Yorumlar alınamadı");
  }
}