Edit since the file did not uploaded :

symposium.php in the folder piklist/parts/widgets
<?php

piklist(‘field’, array(
‘type’ => ‘text’
,’field’ => ‘titre_text’
,’label’ => ‘Title’
,’description’ => ‘C\’est le titre a appliquer’
,’value’ => ‘text’
,’attributes’ => array(
‘class’ => ‘widget-content’
)
));

piklist(‘field’, array(
‘type’ => ‘text’
,’field’ => ‘class_text’
,’label’ => ‘Css class’
,’description’ => ‘Classe a appliquer’
,’value’ => ‘text’
,’attributes’ => array(
‘class’ => ‘widget-content’
)
));

piklist(‘field’, array(
‘type’ => ‘textarea’
,’field’ => ‘contenu_text’
,’label’ => ‘Texte du widget’
,’description’ => ‘Ceci est le text principal du widget’
,’attributes’ => array(
‘class’ => ‘widget-content’
)
));

symposium-form.php in piklist/parts/settings

<?php
/*
Title: Symposium
Description: Un text widget avec une classe
*/
?>
<?php echo $before_widget; ?>

<?php echo $before_title; ?>

<?php echo $settings[‘titre_text’]; ?>

<?php echo $after_title; ?>

<?php echo $settings[‘class_text’]; ?>

<?php echo $settings[‘contenu_text’]; ?>

<?php echo $after_widget; ?>

This is what i get in wordpress wen i put both files in the widgets folder

Warning: fopen(/home/dompteur/public_html/***/wp-content/themes/********/piklist/parts/settings/symposium-widget-form.php): failed to open stream: Aucun fichier ou répertoire de ce type in /home/dompteur/public_html/symposium/wp-includes/functions.php on line 4305

Warning: fread() expects parameter 1 to be resource, boolean given in /home/***/public_html/*******/wp-includes/functions.php on line 4308

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/***/public_html/*******/wp-includes/functions.php on line 4311

Superb this was a sync problem in the end … thanks
Btw your plugin is awesome ill give it 5 stars!