[SOLVED] List of authors & total posts by each

Hi,

I'm a teacher, and for my class blog I want a list in a sidebar of all the students and how many posts each of them has written.

I found the "Executable PHP widget" plugin, and then I found this code to put in the PHP text widget:

<ul>
<?php wp_list_authors();*?>
</ul>

At first, this worked beautifully. Now, however, the list of names remains but the post counts have disappeared.

Does anybody have a solution? I'm strictly a copy-and-paste guy when it comes to php and css.

Thanks,

Eric