Cannot use object of type CI_DB_mysqli_result as array In codeigniter

PHP Code:

<?php
Class Pagination_model extends CI_model
{
    public function __construct()
    {
        parent:: __construct();
        $this->load->library('session');
    }

    function ambil_data($pagination,$offset)
    {
       return $this->db->get("item",$pagination,$offset)->result();
    }
}

PHP Code:

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Pagination extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
        $this->load->model("Pagination_model");
        $this->load->library('pagination');
    }
    public function index($offset=3)
    {
        $data = $this->db->get("item");

        $config['total_row'] = $data->num_rows();
        $config['base_url'] = base_url().'pagination/index';
        $config['per_page'] =3;

        //bootstrap
        $config['full_tag_open'] = "<ul class='pagination pagination-sm' style='position:relative;top:25px;'";
        $config['full_tag_close'] = "</ul>";
        $config['num_tag_open'] = "<li>";
        $config['num_tag_close'] = "</li>";
        $config['cur_tag_open'] = "<li class='disabled'><li class='active'>< a href='#'>";
        $config['cur_tag_close'] = "<span class='sr-only'></span></a></li> ";
        $config['next_tag_open'] = "<li>";
        $config['num_tag_close'] = "</li>";
        $config['prev_tag_open'] = "<li>";
        $config['prev_tag_close'] = "</li>";
        $config['first_tag_open'] = "<li>";
        $config['first_tag_close'] = "</li>";
        $config['last_tag_open'] = "<li>";
        $config['last_tag_close'] = "</li>";

        $this->pagination->initialize($config);

        $data['halaman'] = $this->pagination->create_links();
        $data['offset'] = $offset;

        $data['data'] = $this->Pagination_model->ambil_data($config['per_page'],$offset);


        $this->load->view('pagination',$data);

    }

}

PHP Code:

<table id="example1" class="table table-bordered table-striped table-hover">
    <thead>
    <tr>
        <th style="text-align: center;">Item ID</th>
        <th style="text-align: center;">Item Name</th>

    </tr>
    </thead>
    <tbody>
    <?php
    foreach ($data as $row) {

        ?>
        <tr>
            <td><?=$row->item_id ?></td>
            <td><?=$row->item_name ?></td>

        </tr>
    <?php }
    ?>
    </tbody>
</table>
<?php echo $halaman; ?>