Wp Pagenavi and custom post type problem

Hi,

I’ve a problem to display Wp Pagenavi with my custom post type, it’s doesn’t work -> 404 error page.

Definition of my custom post type :

$labelsExposition = array(
            'name' => _x('Expositions', 'post type general name'),
            'singular_name' => _x('Exposition', 'post type singular name'),
            'add_new' => _x('Ajouter une exposition', 'photo'),
            'add_new_item' => __('Ajouter une exposition'),
            'edit_item' => __('Editer une exposition'),
            'new_item' => __('Nouvelle exposition'),
            'view_item' => __('Voir l\'exposuition'),
            'search_items' => __('Chercher une exposition'),
            'not_found' =>  __('Aucunes expositions trouvées'),
            'parent_item_colon' => '',
            'menu_name' => 'Expositions'
        );
$argsExpositions = array(
            'labels' => $labelsExposition,
            'public' => true,
            'publicly_queryable' => true,
            'show_ui' => true,
            'show_in_menu' => true,
            'query_var' => true,
            'rewrite' => true,
            'capability_type' => 'post',
            'hierarchical' => false,
            'menu_position' => null,
            'supports' => array('editor','thumbnail','title')
        );
        register_post_type('exposition',$argsExpositions);

Permalink structure :

/%category%/%postname%.html

In my category-expositions.php file :

//On récupére tout le contenu de cette catégorie
            $page = (get_query_var('paged')) ? get_query_var('paged') : 1;
            $args = array(
                        'orderby'         => 'post_date',
                        'order'           => 'DESC',
                        'post_type'       => 'exposition',
                        'post_status'     => 'publish',
                        'posts_per_page' => 2,
                        'paged'=> $page
            );
            $posts = new WP_Query( $args );

//On parcoure les posts
            while ( $posts->have_posts() ) : $posts->the_post();

                //on récupere le post ID
                $postId = get_the_ID();    

                //On prépare la récupération des metabox
                $metaExpositions = get_post_meta($postId, 'dateExposition', TRUE);

                    //on affiche
                    echo '<div class="actu">';
                    echo '<div class="actuContent">';
                        echo '<h2>'.get_the_title().'</h2>';
                        echo '<p class="actuDate">'.$metaExpositions['reference'].'</p>';
                        the_content();
                    echo '</div>';

                    //On vérifit si il y a une miniature
                    if(has_post_thumbnail($postId)){

                        //Et on affiche
                        $thumbAttribut = array(
                                'class'    => "actuThumb"
                            );
                        echo '<div class="containerThumbActu">';
                            echo get_the_post_thumbnail($postId,'thumbnail',$thumbAttribut);
                        echo '</div>';
                    }

                echo '</div>';
                echo '<div class="spacer"></div>';
            endwhile;

            //La pagination
            wp_pagenavi(array( 'query' => $posts ) );

Url generate by Wp Pagenavi is like

https://localhost/www.xxxxxxx.com/expositions/page/2

WordPress configuration :
– Version : 3.2
– Version PHP/MySQL : 5.3.0 / 5.1.36
– Thème : custom
– Plugins : Category Images II, Contact Form 7, TinyMCE Advanced, WP-DBManager, WP-PageNavi,WP No Category Base

Every solutions found on internet doesn’t work with me !

Please help me, thanks.