converted to_excel plugin to helper to work in CI 2.0

[eluser]swetha[/eluser]
The following are the code snippets..

Code:

/*export_view.php*/

<?php foreach($q as $row)
         print $row->fest_id;
         print $row->fest_name;
?>
<a >fest_id?&gt;/&lt;?=$row->fest_name?&gt;">Export</a>

          
/*export.php -- controller*/
function event_list()
    {
            $this->load->model('admin/export_model');
            $data['q']=$this->export_model->backup();
            $this->load->view('admin/export_view',$data);
    }
    
    function export_contacts($fest_id='',$fest_name='')
    {
        $this->load->database();
        $this->load->plugin('to_excel');
    
        $this->db->use_table('contacts');
        $this->db->select('*');

        $query = $this->db->query('SELECT * FROM contacts where fest_id=$fest_id');
       $filen=to_excel($query,$fest_name);
      
    }
/*export_model.php*/
function backup()
    {
         $this->load->database();
         $q=$this->db->get('fest');
         return $q->result();
  
    }

What is it that is wrong with this that I face the page not found error?? Need quick help..

Url where i get a 404 error : http://localhost/admin/export_contacts/1/fiesta