codeigniter pagination error 404 - codeigniter

Question

I have Admin controller in codeigniter
class Admin extends CI_Controller {
function __construct() {
parent::__construct();
if (!$this->tank_auth->is_logged_in()) redirect('login');
$this->load->library('pagination');
}
function index() {
$offset = $this->uri->segment(2);
$config['per_page'] = 3;
$data['sitetitle'] = 'Výpis jobů';
$data['listings'] = $this->Jobs_model->get_listings(0,$user_id = FALSE,$config['per_page'],$offset);
$config['uri_segment'] = 2;
$config['base_url'] = base_url().'admin/';
$config['total_rows'] = $this->db->count_all_results('jobs');
$this->pagination->initialize($config);
$this->template->set('title', 'Domovská stránka');
$this->template->load('template', 'site', $data);
}
}
and Jobs_model
function get_listings($category, $user_id = false, $limit = 0, $offset = 0) {
$data = array();
$this->db->order_by('id', 'desc');
$q = $this->db->get('jobs');
if ($category) {
$options = array('category' => $category);
$this->db->order_by('id', 'desc');
$this->db->where('category', $category);
$q = $this->db->get('jobs', $limit, $offset);
}
else {
$query = $this->db->order_by('id', 'desc');
if ($user_id) $query = $query->where('user_id', $user_id);
$q = $query->get('jobs',$limit, $offset);
}
if ($q->num_rows() > 0) {
foreach ($q->result_array() as $row) {
$data[] = $row;
}
}
$q->free_result();
return $data;
}
first page in paginatiom obtain data, but links generating in pagination localhost/sitename/admin/3 produce 404 error.
Where is problem in my script

Answer 1

You need to change:
$config['base_url'] = base_url().'admin/';
To:
$config['base_url'] = base_url().'admin/index/';
If you need the url to be like admin/3, you can use a route or _remap.
Side note: consider using this to get your page number rather than the URI class:
function index($offset = 0) {
// your code
}
It will do the same thing, but it's convenient to use the controller method arguments when possible.

Answer 2

You need to do some change.
$config['base_url']=base_url().'admin/index';
change
$config['uri_segment'] = 3;
check if you are using .htaccess or not. If you aren't, then $config['base_url'] in above should be
$config['base_url']=base_url().'index.php/admin/index';

Answer 3

If you get 404 error on codigniter paggination please check follwing things :
1 ) Check your controller it's index or somthing else if it's index then base_url should be :
base_url().'admin/index/pages' and if it's somethings else it should be :
base_url().'admin/somethingelse/pages'
2 ) Check 'uri_segment' by $this->uri->segment(4) so by this you got the page number then else will do the codiegniter.