Error saat membuat Fitur Lupa Password di Codeigniter

Assalamualaikum Warahmatullahi Wabarakatuh...
mas mau tanya saya mau buat fitur lupa password di sistem yang saya buat tetapi masih error. gimna ya mas solusinya?
 
//Controller
 
                                   Klik di sini untuk mengganti kata sandi Anda.<br>
                                        Atau Anda dapat copas (Copy Paste) url dibawah ini ke address Bar Browser anda :<br>
                                        <a href='".base_url().$this->uri->segment(1)."/reset_password/$usr[nip]'>".base_url().$this->uri->segment(1)."/reset_password/$usr[nip]</a><br><br>
 
                                        Tidak meminta penggantian ini?<br>
                                        Jika Anda tidak meminta kata sandi baru, segera beri tahu kami.<br>
                                        Email. $iden[email], No Telp. $iden[no_telp]</td></tr>
                                    </table>
                                </body></html> \n";
 
                $this->email->from($iden['email'], $iden['nama_website']);
                $this->email->to($usr['email']);
                $this->email->cc('');
                $this->email->bcc('');
 
                $this->email->subject($subject);
                $this->email->message($message);
                $this->email->set_mailtype("html");
                $this->email->send();
 
                $config['protocol'] = 'sendmail';
                $config['mailpath'] = '/usr/sbin/sendmail';
                $config['charset'] = 'utf-8';
                $config['wordwrap'] = TRUE;
                $config['mailtype'] = 'html';
                $this->email->initialize($config);
 
                $data['title'] = 'Password terkirim ke '.$usr['email'];
                $this->load->view(base_url().'login',$data);
            }
        }else{
            $this->load->view('lupa_password');
        }
	}
}
 
//View
 
<div class="main">
	    	<div class="container">
	    		<div class="row">
	    			<div class="col l6 offset-l3 s12">
	    				<div class="card">
	    					<div class="card-header">
	    						<img class="logo" src="<?php base_url() ?>asset/images/<?php echo $identitas['favicon'] ?>" style='width: 200px'>
	    						<p>Silahkan masukan E-mail anda yang terdaftar</p>
	    					</div>
	    					<form action="<?php base_url() ?>lupa_password/" method="POST">
								<div class="row">
									<div class="input-field col s11">
	  									<input id="email" type="text" class="validate" name="email">
	  									<label for="email">E-mail</label>
									</div>
								</div>
								<br>
								<div class="row">
									<div class="col l6 s8">
										<button class="btn-flat">Kembali Login ?</button>
									</div>
									<div class="col l2 offset-l3 s4">
										<button class="waves-effect waves-light btn light-blue darken-2" name="lupa" type="submit">Kirim</button>
									</div>
								</div>
							</form>
	    				</div>
	    			</div>
	    		</div>
	    	</div>
    	</div>
 
dan saya lampirkan juga tabel untuk akses akunnya beserta errornya