Error on pro sites module/gateway admin page: The argument should be an array...

I installed pro sites, but cannot edit the modules page: http://tampasource.com/wp-admin/network/admin.php?page=psts-modules.

The following error message appears at the top of the page, and no options are available for me to edit: Warning: uasort() [function.uasort]: The argument should be an array in /home/tmpasrce/public_html/wp-content/plugins/pro-sites/pro-sites.php on line 2745