Can’t see categories on webpage

<div class="widget_style" id="categories">
<span><h2><?php _e('Categories','business'); ?></h2></span>
<ul>
<?php wp_list_categories('show_count=0&title_li=0'); ?>
</ul>
</div>

Can anyone tell me what do i have to change to make all categories to be shown on webpage? It shows only the default categorie.

Thanks !