DataTables warning: table id=admin_user_datatable - Requested unknown parameter '0' for row 0, colum

I am using this datatable server side processing in codeigniter 4 but i found error

DataTables warning: table id=admin_user_datatable - Requested unknown parameter '0' for row 0, column 0. For more information about this error, please see http://datatables.net/tn/4

controller:

public function ajaxDataTables()
{
$users=new UserModel();
$data = array();

       $params['draw'] = @$_POST['draw'];
        $start = @$_POST['start'];
        $length = @$_POST['length'];
        $search_value = @$_POST['search']['value'];

       if(!empty($search_value)){
            $total_count = $this->db->query("SELECT employee_name,employee_email,employee_phone from users WHERE id like '%".$search_value."%' OR employee_name like '%".$search_value."%' OR  employee_email like '%".$search_value."%' OR employee_phone like '%".$search_value."%'")->getResult();

            $data = $this->$db->query("SELECT employee_name,employee_email,employee_phone from users WHERE id like '%".$search_value."%' OR employee_name like '%".$search_value."%' OR employee_email like '%".$search_value."%' OR employee_phone like '%".$search_value."%' limit $start, $length")->getResult();

        }else{
            // count all data
            $total_count = $this->db->query("SELECT employee_name,employee_email,employee_phone from users")->getResult();

            // get per page data
            $data = $this->db->query("SELECT employee_name,employee_email,employee_phone from users limit $start, $length")->getResult();
        }
        $no = @$_POST['start'];
        foreach ($data as $employee) {
            $no++;
            $row = array();
            $row[] = $no;
            $row[] = $employee->employee_name;
            $row[] = $employee->employee_email;
            $row[] = $employee->employee_phone;
            $row[] ='<a href=""><span class="role member">Update</span></a> || <a href=""><span class="role admin">Delete</span></a>';
            $data[] = $row;
        }

        $json_data = array(
        "draw" => @$_POST['draw'],
        "recordsTotal" => count($total_count),
        "recordsFiltered" => count($total_count),
        "data" => $data   // total data array
        );

        echo json_encode($json_data);

}

var site_url = "<?php echo site_url(); ?>"; $(document).ready( function () { $('#admin_user_datatable').DataTable({ paginationType: "full_numbers", lengthMenu: [[ 10, 30, -1], [ 10, 30, "All"]], processing: true, serverSide: true, scrollY: "400px", scrollCollapse: true, ajax: { url: site_url + "/ajax-datatable", // json datasource type: "post", data: { // key1: value1 - in case if we want send data with request } }, columnDefs: [ { orderable: false, targets: [0, 1, 2, 3] } ], // bFilter: true, // to display datatable search }); });