[Plugin: WP-dTree] a simple question for you

I am a beginner. Could you tell me how to rewrite the code because it no longer works since the update WPDTREE.

Thank you very much for your help

<?php
if (function_exists(‘wp_dtree_get_categories’)){
wp_dtree_get_categories();
}else{
wp_list_categories(‘show_count=1’);
}
?>