Warum zeigt mein Codeigniter 3-Setup ständig den Fehler 404 an? ⇐ Php

[Anonymous]

Mit Codeigniter 3 habe ich Folgendes geändert.
config

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$config['base_url'] = 'http://demo.xyz.com/xyz/';
$config['log_threshold'] = 4 ;
$config['index_page'] = '';
$config['uri_protocol'] = 'REQUEST_URI';

Routen

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$route['default_controller'] = 'Admin';

Controller

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class Admin extends CI_Controller
{
public function __construct()
{
parent::__construct();

$this->load->model('admin_model');
$this->load->helper('url');
$this->load->library("session");
$this->load->helper('form');
$this->load->library('form_validation');
}

public function index()
{
if(!$this->session->userdata('Usr_Mobile_No'))
{
redirect('admin/login');
}

$this->load->view('admin/index');
}
public function check_login()
{
//$name = $this->input->post('name');
$user_type   = $this->input->post('user_type');
$mobile   = $this->input->post('mobile');
$password   = $this->input->post('password');
$admin_panel   = $this->input->post('admin_panel');

$new_data = array('Usr_Mobile_No' => $mobile);
$this->session->set_userdata($new_data);

$sql1 = $this->admin_model->check_admin_login($user_type, $mobile, $password);
$redirect = base_url('admin/index');
$data['redirect']            = $redirect;
echo json_encode($data);
}

.htaccess

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RewriteEngine on
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

In meinem Ansichtsordner habe ich login.php mit dem folgenden Code

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