Page vierge lors de la validation d'un formulaire

J'apprends à développer avec codeigniter 3.1.8, pour cela je suis confronté à un problème:je suis redirigé vers une page blanche et mes erreurs ne s'affichent pas. s'il vous plaît je voudrais que vous me donnez un coup de main

voici la fonction du modèle pour l'insertion

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class M_root extends CI_Model{



    function isertion_root(){
        $root=array(
            'nom_admin'=>'$user_name',
            'prenom_admin'=>'$user_prenom',
            'email_admin'=>'$user_email',
            'date_nais_admin'=>'$date_nais',
            'date_inscription_admin'=>'NOW(),false',
            'avatar_root'=>'$avatar_root',
            'password_root'=>'$pssword_root'

        );
        $this->db->insert('root', $root);
    }

    /**
     * @param $email
     * @param $password
     * @return bool
     */
    function login_root($email,$password){

        $this->db->select('*');
        $this->db->from('root');
        $this->db->where('email_admin',$email);
        $this->db->where('password_root',$password);

        if ($query=$this->db->get())
        {
            return $query->row_array();
        }
        else{
            return false;
        }
    }

    public function email_check($email_admin){

        $this->db->select('*');
        $this->db->from('root');
        $this->db->where('email_admin',$email_admin);
        $query=$this->db->get();

        if($query->num_rows()>0){
            return false;
        }else{
            return true;
        }

    }


}

voici la fonction du contrôleur pour l'insertion

class Root extends CI_Controller{

    function __construct(){
        parent:: __construct();
        $this->load->database();
        $this->load->model('M_root');
        $this->load->library('upload');
        $this->load->library('form_validation');
        $this->load->helper(array('form', 'url'));
        $this->load->library('session');

    }

    public function index()
       {
        $this->load->view("register.php");
        }

        //debut fonction d'enregistrement

        public function isertion_root(){
            if($this->input->post('registersubmit')){

            $config['upload_path']          = './assets/avatar-root/';
            $config['allowed_types']        = 'gif|jpg|png';
            $config['max_size']             = 100;
            $config['max_width']            = 1024;
            $config['max_height']           = 768;
            $this->upload->initialize($config);
            if(!empty($_FILES['filefoto']['name']))
            {
                if ($this->upload->do_upload('filefoto'))
                {
                    $gbr = $this->upload->data();
                    //Compress Image
                    $config['image_library']='gd2';
                    $config['source_image']='./assets/avatar-root/'.$gbr['file_name'];
                    $config['create_thumb']= FALSE;
                    $config['maintain_ratio']= FALSE;
                    $config['quality']= '60%';
                    $config['new_image']= './assets/avatar-root/'.$gbr['file_name'];
                    $this->load->library('image_lib', $config);
                    $this->image_lib->resize();


                    $this->form_validation->set_rules('nom_admin', 'nom administrateur', 'trim|required|min_length[3]|max_length[23]|alpha_dash|encode_php_tags|xss_clean');
                    $this->form_validation->set_rules('prenom_admin', 'prenom administrateur', 'trim|required|alpha_dash|encode_php_tags|xss_clean');
                    $this->form_validation->set_rules('email_admin', 'Email administrateur', 'trim|required|valid_email|xss_clean');
                    $this->form_validation->set_rules('date_nais_admin', 'Date de naissance administateur', 'trim|required');
                    $this->form_validation->set_rules('avatar_root', 'Avatar root', 'trim|required');
                    $this->form_validation->set_rules('password_root', 'password root', 'trim|required|min_length[8]|xss_clean');
                    $this->form_validation->set_rules('conf_password', 'confirm password', 'trim|required|matches[password]');

                        $root = array(
                            'nom_admin' => strip_tags($this->input->post('nom_admin')),
                            'prenom_admin' => strip_tags($this->input->post('prenom_admin')),
                            'email_admin' => strip_tags($this->input->post('email_admin')),
                            'date_nais_admin' => strip_tags($this->input->post('date_nais_admin')),
                            'avatar_root' => strip_tags($this->input->post('avatar_root')),
                            'password_root' => password_hash($this->input->post('password'),PASSWORD_DEFAULT)


                        );
                        print_r($root);
                        if ($this->form_validation->run() == TRUE)
                    {

                        $email_check=$this->M_root->email_check($root['email_admin']);

                       if($email_check){
                               $this->M_root->isertion_root($root);
                                $this->session->set_flashdata('success_msg', 'Registered successfully.Now login to your account.');
                        redirect('root/login_view');

                                   }
                    }
                                     else{

                                    $this->load->view('register');


                                }

            }

        }
        }

    }
//fin fonction d'enregistrement

la vue

<span style="background-color:red;">
  <div class="container">
      <div class="row">
          <div class="col-md-4 col-md-offset-4">
              <div class="login-panel panel panel-success">
                  <div class="panel-heading">
                      <h3 class="panel-title">Creation d'un compte</h3>
                  </div>
                  <div class="panel-body">

                  <p class="alert-danger"><?php
                  $error_msg=$this->session->flashdata('error_msg');
                  if($error_msg){
                    echo $error_msg;
                  }
                   ?></p>
                     <?php echo validation_errors(); ?>
                      <form role="form" method="post" enctype="multipart/form-data" autocomplete="off" action="<?php echo base_url().'Root/isertion_root'?>">
                          <fieldset>
                              <div class="form-group">
                                <?php echo form_error('nom_admin'); ?>
                                  <input class="form-control" placeholder="Votre nom" name="nom_admin" value="<?php echo set_value('nom_admin'); ?>"type="text" autofocus>
                              </div>

                               <div class="form-group">
                                  <input class="form-control" placeholder="Votre prenom" name="prenom_admin" type="text" autofocus>
                              </div>

                              <div class="form-group">
                                  <input class="form-control" placeholder="E-mail" name="email_admin" type="email" autofocus>
                              </div>
                              <div class="form-group">

                              <div class="form-group">
                                  <input class="form-control" placeholder="votre date de naissance" name="date_nais_admin" type="date" value="">
                              </div>

                               <div class="form-group">
                                  <input class="form-control" placeholder="mot de passe " name="password_root" type="password" value="">
                              </div>

                                  <div class="form-group">
                                  <input class="form-control" placeholder="confirmez votre mot de passe" name="conf_password" type="password" value="">
                              </div>

                              <div class="form-group">
                                  <input class="form-control" placeholder="votre photo" name="avatar_root" type="file" value="">
                              </div>

                              <input class="btn btn-lg btn-success btn-block" type="submit" value="Register" name="registersubmit" >

                          </fieldset>
                      </form>
                      <center><b>Already registered ?</b> <br></b><a href="<?php echo base_url('root/login_view'); ?>">Login here</a></center><!--for centered text-->
                  </div>
              </div>
          </div>
      </div>
  </div>





</span>