Why This CSVimport library don't run !!

anyone can help me??
i have a library csv import for this link csvimport

and i have i controller :
class Csv extends CI_Controller {

function __construct() {
parent::__construct();
$this->load->model('csv_model');

}

function index() {
$data['table_upload'] = $this->csv_model->get_table_upload();
$this->load->view('csvindex', $data);
}

function importcsv($config) {
$data['table_upload'] = $this->csv_model->get_table_upload();
$data['error'] = ''; //kalau upload error
$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'csv';
$config['max_size'] = '1000';
$this->load->library('upload', $config);



if (!$this->upload->do_upload()) {
$data['error'] = $this->upload->display_errors();
$this->load->view('csvindex', $data);
} else {
$file_data = $this->upload->data();
$file_path = './uploads/'.$file_data['file_name'];

if ($this->csvimport->get_array($file_path)) {
$csv_array = $this->csvimport->get_array($file_path);
foreach ($csv_array as $row) {
$insert_data = array(
'no_transaksi' =>$row['no_transaksi'],
'tgl_transaksi' =>$row['tgl_transaksi'],
'jatuh_tempo' =>$row['jatuh_tempo'],
'pelanggan' =>$row['pelanggan'],
'lokasi' =>$row['lokasi'],
'mata_uang' =>$row['mata_uang'],
'nilai_tukar' =>$row['nilai_tukar'],
'tipe_pembayaran' =>$row['tipe_pembayaran'],
'pembayaran_tem' =>$row['pembayaran_tem'],
'wiraniaga' =>$row['wiraniaga'],
'admin' =>$row['admin'],
'keterangan_transaksi' =>$row['keterangan_transaksi'],
'plu' =>$row['plu'],
'nama_barang' =>$row['nama_barang'],
'deskripsi_barang' =>$row['deskripsi_barang'],
'jumlah' =>$row['jumlah'],
'satuan' =>$row['satuan'],
'harga_barang' =>$row['harga_barang'],
'diskon' =>$row['diskon'],
'diskon_sub_total' =>$row['diskon_sub_total'],
'tax_sub_total' =>$row['tax_sub_total'],
'sub_total' =>$row['sub_total'],
'inv_diskon' =>$row['inv_diskon']
);
$this->csv_model->insert_csv($insert_data);
}
$this->session->set_flashdata('Berhasil', 'data telah di simpan');
redirect(base_url().'/csv');
echo "<pre>"; print_r($insert_data);
} else
//$data['error'] = "Error";
$this->load->view('csvindex', $data);
}

}

}

but, if i running,, i have error,, 404 not found?? i use codeigniter last ver.