Pagination codeigniter 404 page not found

gan ketika saya mengklik page selanjutnya keluarnya malah 404 page not found

1.gan ini routenya:

$route['article/terpopuler'] = 'MainController/terpopuler';

2.controllernya:

public function terpopuler($offset=0){
          $getdata = $this->db->get('news');
          $config['total_rows'] = $getdata->num_rows();
          $config['base_url'] = base_url(). 'article/terpopuler/maincontroller/terpopuler';
          $config['per_page'] = 16;

          $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='disable'><li class='active'><a href='#'>";
          $config['cur_tag_close'] = "<span class='sr-only'></span></a></li>";
          $config['next_tag_open'] = "<li>";
          $config['next_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['contentpage'] = $this->news_model->get_terpopuler_pagination($config['per_page'],$offset);
          $this->load->view('pages/article',$data);
          $this->load->view('template/footer');
        }

3.modelnya

public function get_terpopuler_pagination($perpage,$offset){
          $query = $this->db->query("SELECT * FROM news ORDER BY visitor DESC LIMIT $perpage OFFSET $offset");
          return $query->result();
        }

4.viewnya

<div class="container mycontain">
      <div class="row">

        <?php foreach ($contentpage as $item): ?>
        <div class="col mb-4">
          <div class="card mycard-pemprograman">
            <a href="<?php echo base_url();?>article/<?php echo $item->slug; ?>"><img class="card-img-top" src="<?php echo base_url(); ?>upload/<?php echo $item->foto; ?>" alt="Card image cap"></a>
            <div class="card-body">
              <a href="<?php echo base_url();?>article/<?php echo $item->slug; ?>"><h6 class="card-title"><?php echo $item->title; ?></h6></a>
            </div>
          </div>
        </div>
        <?php endforeach; ?>

      </div>
      <?php echo $halaman; ?>
    </div>

awalnya saya mengakses http://localhost/projekWebsite/article/terpopuler/ setelah itu saya klik page selanjutnya otomatis kan url berubah menjadi http://localhost/projekWebsite/article/terpopuler/maincontroller/terpopuler/16 dan munculnya malah 404 page not found padahal saya memiliki data sekitar >50 dari table news. apa mungkin ini kesalahan dari route atau dari url tambahan maincontroller/terpopuler/ kode di atas sudah saya coba gak ada error gan, mohon bantuanya gan analisisnya (terima kasih)