form_error not displayed

Hello everybody !

I'm developping a web application using CodeIgniter with form helper and form_validation library.

I'm trying to do a form with 15 fields to fill. The action of the form calls a method named "add()" which is :

PHP Code:

public function add(){

        /*Vérification qu'un utilisateur est connecté afin d'éviter qu'un utilisateur déconnecté puisse soumettre le formulaire*/
        if($this->session->userdata('id')){

            /*ETAPE 1 : chargement de la librairie contenant les regex*/
            $this->load->library('regex_lib');


            /*ETAPE 2 : définition des règles de vérification des champs du formulaire*/
            $this->form_validation->set_rules("client","Client","required|regex_match[".$this->regex_lib->RegList('alphaNumSpaceChar')."]");
            $this->form_validation->set_rules("departement","Departement","required|regex_match[".$this->regex_lib->RegList('departement')."]");
            $this->form_validation->set_rules("source","Source","required|regex_match[".$this->regex_lib->RegList('alphaNumSpaceChar')."]");
            $this->form_validation->set_rules("ca","Chiffre d'affaire","required|numeric");
            $this->form_validation->set_rules("nbr_version","Nombre de versions","required|integer");
            $this->form_validation->set_rules("type","Type","required|regex_match[".$this->regex_lib->RegList('type')."]");
            $this->form_validation->set_rules("date_devis","Date du devis","required|regex_match[".$this->regex_lib->RegList('date')."]");
            $this->form_validation->set_rules("date_relance","Date de relance","required|regex_match[".$this->regex_lib->RegList('date')."]");
            $this->form_validation->set_rules("taux_reussite","Taux de réussite","required|regex_match[".$this->regex_lib->RegList('pourcentage')."]");
            $this->form_validation->set_rules("prospection","Prospection","required|integer");
            $this->form_validation->set_rules("travail","Travail","required|integer");
            $this->form_validation->set_rules("signature","Signature","required|integer");
            $this->form_validation->set_rules("suivi","Suivi","required|integer");
            $this->form_validation->set_rules("tps_deplacement","Temps de déplacement","required|numeric");
            $this->form_validation->set_rules("validation","Validation","required|regex_match[".$this->regex_lib->RegList('true_false')."]");

            /*ETAPE 3 : mise en forme des messages d'erreur*/
            $this->form_validation->set_error_delimiters('<div class="alert alert-danger">', '</div>');
            $this->form_validation->set_message("required","Vous avez oublié de spécifier le champ '%s'");
            $this->form_validation->set_message("numeric","Le format du champ '%s' n'est pas valide");
            $this->form_validation->set_message("integer","Le format du champ '%s' n'est pas valide");
            $this->form_validation->set_message("regex_match","Le champ '%s' n'est pas valide");


            /*ETAPE 4 : vérification de la présence d'erreur dans le formulaire*/
            if($this->form_validation->run() == false){
                $this->create();
            }else{
                exit('test success');
                $this->devis_model->addDevis();
                $this->session->set_flashdata('devis_created',"<div class='alert alert-success'>Votre devis a correctement été ajouté.</div>");
                $this->lister();
            }

        /*Dans le cas où l'utilisateur n'est pas connecté, il est redirigé vers la page de connexion*/
        }else{
            $this->getLayout('accueil');
        }

    } 


Comments are in french, but the only thing i do different from CI documentation is loading a library containing all my regex.
It's not the first time i do this kind of form and it has always worked so far.

For info "create()" is a method used to load the view.

The problem is : errors are not displayed in view when i'm using for exemple with the first field:

PHP Code:

<?php echo form_error('client'); ?>

I really don't understand what's going wrong, I've tried to use

PHP Code:

<?php echo validation_errors(); ?>

but nothing is displayed.

Here is my view :

PHP Code:

<form class="form-horizontal" action="<?php echo site_url('devis/add');?>" method="post">

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="client">Client</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="client" name="client" placeholder="Nom, prénom, ville">
                </div>
                <?php echo form_error('client'); ?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="departement">Département</label>
                <div class="col-xs-12 col-sm-8">
                    <select class="form-control" id="departement" name="departement">
                        <?php
                        foreach($dep as $key=>$value){
                            ?>
                            <option value="<?php echo $value->departement_id;?>"><?php echo $value->departement_code . " - " . $value->departement_nom; ?></option>
                        <?php
                        }
                        ?>
                    </select>
                </div>
                <?php echo form_error('departement');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="source">Source</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="source" name="source" placeholder="Nom du contact">
                </div>
                <?php echo form_error('source');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="ca">Chiffre d'affaire</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="ca" name="ca" placeholder="Chiffre d'affaire hors taxes, sans éco-part">
                </div>
                <?php echo form_error('ca');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="nbr_version">Nombre de versions</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="nbr_version" name="nbr_version">
                </div>
                <?php echo form_error('nbr_version');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label">Type</label>
                <div class="col-xs-12 col-sm-8">
                    <label class="radio-inline">
                        <input type="radio" name="type" id="type1" value="int">Intérieur
                    </label>
                    <label class="radio-inline">
                        <input type="radio" name="type" id="type2" value="ext">Extérieur
                    </label>
                    <label class="radio-inline">
                        <input type="radio" name="type" id="type3" value="int_ext">Intérieur & extérieur
                    </label>
                </div>
                <?php echo form_error('type');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="date_devis">Date du devis</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="date_devis" name="date_devis" placeholder="Date au format jj/mm/aaaa, ex: 12/05/2014">
                </div>
                <?php echo form_error('date_devis');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="date_relance">Date de la relance</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="date_relance" name="date_relance" placeholder="Date au format jj/mm/aaaa, ex: 12/05/2014">
                </div>
                <?php echo form_error('date_relance');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="taux_reussite">Taux de réussite</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="taux_reussite" name="taux_reussite" placeholder="A exprimer en pourcentage, ex : 90 (pour 90%)">
                </div>
                <?php echo form_error('taux_reussite');?>
            </div>

            <br />
            <h4>Nombre de rendez-vous :</h4>
            <hr />

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="prospection">Prospection</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="prospection" name="prospection">
                </div>
                <?php echo form_error('prospection');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="travail">Travail</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="travail" name="travail">
                </div>
                <?php echo form_error('travail');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="signature">Signature</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="signature" name="signature">
                </div>
                <?php echo form_error('signature');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="suivi">Suivi</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="suivi" name="suivi">
                </div>
                <?php echo form_error('suivi');?>
            </div>

            <div class="form-group">
                <label class="col-xs-12 col-sm-4 control-label" for="tps_deplacement">Temps de déplacement</label>
                <div class="col-xs-12 col-sm-8">
                    <input type="text" class="form-control" id="tps_deplacement" name="tps_deplacement" placeholder="A exprimer en heure, ex : 3,5 (pour 3 heures et demie)">
                </div>
                <?php echo form_error('tps_deplacement');?>
            </div>

            <div class="form-group">
                <div class="col-sm-8 col-sm-offset-4">
                    <div class="checkbox">
                        <label>
                            <input type="checkbox" id="validation" name="validation" value="validation">Validation
                        </label>
                    </div>
                    <?php echo form_error('validation');?>
                </div>
            </div>

            <div class="form-group">
                <div class="col-sm-8 col-sm-offset-4">
                    <button type="submit" class="btn btn-primary">Valider</button>
                </div>
            </div>

        </form> 


If you need more precision, don't hesitate to ask.

Thank you, have nice christmas holidays !!