Codeigniter - 404页面未找到

我使用Codeigniter。一切都很好，直到我创建名为user_authentication.php(位于http://localhost/etalasekursusci/index.php/user_authentication)的新控制器。当我尝试打开这个控制器时，浏览器显示"404 Page Not Found"。您请求的页面未找到"。我在http://localhost/etalasekursusci/index.php/controller和http://localhost/etalasekursusci/index.php/user上的控制器文件工作得很好，只是这个失败了。

(仅供参考，我从朋友那里复制了user_authentication.php文件。如果我把user类里面的脚本复制到user_authentication类，user_authentication.php可以被访问…)

/应用程序/。Htaccess文件:

<IfModule authz_core_module>
    Require all denied
</IfModule>
<IfModule !authz_core_module>
    Deny from all
</IfModule>

/application/config/config.php文件:

$config['base_url'] = 'http://localhost/etalasekursusci/';

/application/config/routes.php文件:

$route['default_controller'] = 'controller';
$route['404_override'] = '';
$route['translate_uri_dashes'] = FALSE;

/application/controllers/user.php文件:

<?php
class user extends CI_Controller {
public function __construct()
{
    parent::__construct();
    $this->load->model('user_model');
}
public function index()
{
    $this->load->library('form_validation');
    $this->form_validation->set_error_delimiters('<div class="error">', '</div>');
    $this->form_validation->set_rules('nama', 'Nama Kursus', 'required|min_length[5]|max_length[20]');
    $this->form_validation->set_rules('alamat', 'Alamat Kursus', 'required|min_length[5]|max_length[40]');
    if ($this->form_validation->run() == FALSE)
    {
        $this->load->view('register_user');
    }
    else
    {
        $data = array(
        'lembaga' => $this->input->post('nama'),
        'alamat' => $this->input->post('alamat'),
        'paketkursus' => $this->input->post('paket'),
        'lokasi' => $this->input->post('lokasi'),
        'harga' => $this->input->post('biaya')
        );
        $this->user_model->insert_userinfo($data);
        $this->load->view('tambahberhasil');
    }
}
}

/application/controllers/user_authentication.php文件:

<?php
class user_authentication extends CI_Controller {
public function __construct() {
parent::__construct();

$this->load->helper('form');

$this->load->library('form_validation');

$this->load->library('session');

$this->load->model('login_database');
}

public function user_login_show() {
$this->load->view('login_form');
}
public function user_registration_show() {
$this->load->view('registration_form');
}
public function new_user_registration() {
$this->form_validation->set_error_delimiters('<div class="error">', '</div>');
$this->form_validation->set_rules('name', 'Name', 'required|min_length[5]|max_length[20]');
$this->form_validation->set_rules('username', 'Username', 'required|min_length[5]|max_length[40]');
$this->form_validation->set_rules('email_value', 'Email', 'required|min_length[2]|max_length[50]');
$this->form_validation->set_rules('password', 'Password', 'required|min_length[6]|max_length[10]');
if ($this->form_validation->run() == FALSE) {
$this->load->view('registration_form');
} else {
$data = array(
'name' => $this->input->post('name'),
'user_name' => $this->input->post('username'),
'user_email' => $this->input->post('email_value'),
'user_password' => $this->input->post('password')
);
$result = $this->login_database->registration_insert($data) ;
if ($result == TRUE) {
$data['message_display'] = 'Registrasi Berhasil !';
$this->load->view('login_form', $data);
} else {
$data['message_display'] = 'Username yang ada inputkan sudah ada!';
$this->load->view('registration_form', $data);
}
}
}

public function user_login_process() {
$this->form_validation->set_error_delimiters('<div class="error">', '</div>');
$this->form_validation->set_rules('username', 'Username', 'required|min_length[5]|max_length[20]');
$this->form_validation->set_rules('password', 'Password', 'required|min_length[5]|max_length[40]');
if ($this->form_validation->run() == FALSE) {
$this->load->view('login_form');
} else {
$data = array(
'username' => $this->input->post('username'),
'password' => $this->input->post('password')
);
$result = $this->login_database->login($data);
if($result == TRUE){
$sess_array = array(
'username' => $this->input->post('username')
);
$this->session->set_userdata('logged_in', $sess_array);
$result = $this->login_database->read_user_information($sess_array);
if($result != false){
$data = array(
'name' =>$result[0]->name,
'username' =>$result[0]->user_name,
'email' =>$result[0]->user_email,
'password' =>$result[0]->user_password
);
$this->load->view('admin_page', $data);
}
}else{
$data = array(
'error_message' => 'Nama atau Password yang anda masukan salah !'
);
$this->load->view('login_form', $data);
}
}
}

public function logout() {
$sess_array = array(
'username' => ''
);
$this->session->unset_userdata('logged_in', $sess_array);
$data['message_display'] = 'Anda sudah Log Out !';
$this->load->view('login_form', $data);
}
}

任何想法?

(仅供参考，我从朋友那里复制了user_authentication.php文件。如果我将user类内的脚本复制到user_authentication类，user_authentication.php可以被访问…)