Membuat Form Seperti Tracking Order di Toko Online

Assalam,.. untuk pesan error yang muncul apa mas, 
sekalian share printscreen pesan errornya?
agar bisa kita bantu cek,..

Assalam,.. coba ubah ini :
if ($this->uri->segment(3)!=''){
	$no_pendaftaran = filter($this->uri->segment(3));
}else{
	$no_pendaftaran = filter($this->input->post('a'));
}
 
ubah menjadi begini : 
if ($this->uri->segment(3)!=''){
	$no_pendaftaran = strip_tags($this->uri->segment(3));
}else{
	$no_pendaftaran = strip_tags($this->input->post('a'));
}

Assalam,.. oh alhamdulilah mas sudah bisa, terimakasih

Assalam,.. oh iya mas minta bantuannya lagi mengenai pertayaan saya yang ini https://members.phpmu.com/forum/read/tidak-ada-notif-salah-input-captcha-di-sikolag-ci
 
notif sudah muncul atas bantun mas bukhari cuma bisa ga ketika notif itu di close jangan jadi reload halaman tapi fokus ke inputan captcha nya aja
 
dan mengenai input username yg sama jadi errorr tidak ada notifikasi username sudah digunakan

Assalam,..  ini coding di controller nya mas , alert na ngereload halaman  ketika di close, supaya ketika di close ga ngereload dan focus ke inputan captcha bagaimana?
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Kontributor extends CI_Controller {
	public function index(){
		$data['title'] = "Pendaftaran Kontributor";
		$data['description'] = description();
		$data['keywords'] = keywords();
 
		$this->load->helper('captcha');
		$vals = array(
            'img_path'	 => './captcha/',
            'img_url'	 => base_url().'captcha/',
            'font_path' => './asset/Tahoma.ttf',
            'font_size'     => 15,
            'img_width'	 => '150',
            'img_height' => 40,
            'border' => 0, 
            'word_length'   => 5,
            'expiration' => 7200
        );
 
        $cap = create_captcha($vals);
        $data['image'] = $cap['image'];
        $this->session->set_userdata('mycaptcha', $cap['word']);
		$this->template->load(template().'/template',template().'/kontributor',$data);
	}
 
	function pendaftaran(){
		if (isset($_POST['submit'])){
			$config['upload_path'] = 'asset/foto_user/';
            $config['allowed_types'] = 'gif|jpg|png|JPG|JPEG';
            $config['max_size'] = '1000'; // kb
            $this->load->library('upload', $config);
            $this->upload->do_upload('f');
            $hasil=$this->upload->data();
            if ($this->input->post() && (strtolower($this->input->post('secutity_code')) == strtolower($this->session->userdata('mycaptcha')))) {
	            if ($hasil['file_name']==''){
	                    $data = array('username'=>cetak($this->input->post('a')),
	                                    'password'=>hash("sha512", md5(cetak($this->input->post('b')))),
	                                    'nama_lengkap'=>cetak($this->input->post('c')),
	                                    'email'=>cetak($this->input->post('d')),
	                                    'no_telp'=>cetak($this->input->post('e')),
	                                    'level'=>'kontributor',
	                                    'blokir'=>'N',
	                                    'id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis'));
	            }else{
	                    $data = array('username'=>cetak($this->input->post('a')),
	                                    'password'=>hash("sha512", md5(cetak($this->input->post('b')))),
	                                    'nama_lengkap'=>cetak($this->input->post('c')),
	                                    'email'=>cetak($this->input->post('d')),
	                                    'no_telp'=>cetak($this->input->post('e')),
	                                    'foto'=>$hasil['file_name'],
	                                    'level'=>'kontributor',
	                                    'blokir'=>'N',
	                                    'id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis'));
	            }
 
	            $this->model_app->insert('users',$data);
	            $datam = array('id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis'),
	                           'id_modul'=>18);
	            $this->model_app->insert('users_modul',$datam);
	            $this->session->set_userdata('upload_image_file_manager',true);
				$this->session->set_userdata(array('username'=>cetak($this->input->post('a')),
								   'level'=>'kontributor',
                                   'id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis')));
			redirect('administrator/home');
		}else{
			echo"<script>window.alert('Maaf captcha tidak sesuai');
			window.location=('".base_url()."kontributor')</script>";
		}
		}
	}
}