当使用JSON.stringify(responeText[1])时，DataTables RowsGroup插件不能工

手动声明数据(工作正常):

var data = [
                            ["imran_15","David","Maths","80","20","10"],
                            ["imran_15","David","Maths","80","20","10"],
                            ["farhana_06","SIP/8002","03-09-2016","06:57:17am","03-09-2016","04:01:41pm"],
                            ["imran_15","SIP/8001","03-09-2016","03:59:35pm","03-09-2016","09:55:14pm"],
                            ["jannatul_66","SIP/8003","03-09-2016","10:15:34am","03-09-2016","10:26:26am"],
                            ["jannatul_66","SIP/8003","03-09-2016","10:26:31am","03-09-2016","03:59:33pm"],
                        ]; 

var data = JSON.stringify(responeText[1]);输出:

[
["imran_15","David","Maths","80","20","10"],
["imran_15","David","Maths","80","20","10"],
["imran_15","David","Maths","80","20","10"],
["farhana_06","SIP/8002","03-09-2016","06:57:17am","03-09-2016","04:01:41pm"],
["imran_15","SIP/8001","03-09-2016","03:59:35pm","03-09-2016","09:55:14pm"],
["jannatul_66","SIP/8003","03-09-2016","10:15:34am","03-09-2016","10:26:26am"],
["jannatul_66","SIP/8003","03-09-2016","10:26:31am","03-09-2016","03:59:33pm"]

]
JS:

var data = JSON.stringify(responeText[1]);
            $('#table_id').DataTable({
                "lengthMenu": [ [10, 25, 50, 100, -1], [10, 25, 50, 100, "All"] ],
                "columns": [
                        {
                            name: 'first',
                            title: 'Agent Name',
                        },
                        {
                            name: 'second',
                            title: 'Extension',
                        },
                        {
                            name: 'third',
                            title: 'Login Date',
                        },
                        {
                            name: 'fourth',
                            title: 'Login Time',
                        },
                        {
                            name: 'fifth',
                            title: 'Logout Date',
                        },
                        {
                            name: 'sixth',
                            title: 'Logout Time',
                        },
                    ],
                "data": data,

                "rowsGroup": [
                              'first:name',
                            ],  
            });

当显示错误时:第一个警报:数据表警告:表id=table_id -请求未知参数'1'为行0。有关此错误的详细信息，请参阅http://datatables.net/tn/4第二个警报:数据表警告:表id=table_id -请求未知参数'1'为行0。有关此错误的详细信息，请参阅http://datatables.net/tn/4

请大家帮帮我。