Fatal error: Cannot redeclare class User

[eluser]SamoualSys[/eluser]
Fatal error: Cannot redeclare class User in C:\xampp\htdocs\test\application\models\user.php on line 36
i have this error msg with white screen
my model code is

Code:

<?php
Class User extends CI_Model
{
  function login($user, $pass)
  {
    $this -> db -> select('id, user, password');
    $this -> db -> from('users');
    $this -> db -> where('user = ' . "'" . $user . "'");
    $this -> db -> where('password = ' . "'" . MD5($pass) . "'");
    $this -> db -> limit(1);
  
    $query = $this -> db -> get();
  
    if($query -> num_rows() == 1)
    {
      return $query->result();
    }
    else
    {
      return false;
    }
  }
  function insert_user()
    {
        $this->user   = $_POST['username']; // inser new user to data base
        $this->password = $_POST['password'];
        $this->email = $_POST['email'];
      //  $this->date    = time();

        $this->db->insert('users', $this);
        return ;
    }
    
    
    
}?>

my controler code is

Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
  
class User extends CI_Controller {
  
  function __construct()
  {
    parent::__construct();
  }
  
  function index()
   {
   if($this->session->userdata('logged_in'))
    {
     $session_data = $this->session->userdata('logged_in');
      $userlogin['user'] = $session_data['user'];
   $this->load->view('user',$userlogin);
  }
   else
    {
      //If no session, redirect to login page
      redirect('login', 'refresh');
    }
  }}
  
?>

can you help and explain what this error mean please