bagaimana cara mengatasi Too few arguments to function, ini cukup menjengkelkan

//controller =================================
   public function delete_Topik($id)
   {
      $this->UjianTopik_Model->delete_T($id);
      redirect('admin/data_topik');
   }

//model =======================================
      public function delete_T($id)
      {
             return $this->db->delete('topik', array('topik_id' => $id));
      }

//view ==========================================
<form action="<?= base_url('admin/delete_Topik/' . $tu['topik_id']); ?>" method="DELETE">
   <button type="submit" class="btn" onclick="return confirm('apakah anda yakin ingin menghapus data tersebut ?')" ><i class="fa fa-trash"></i></button>
</form>