regarding the affiliate plugin

when testing the affiliate plugin, I log in to my test affiliate account and i am getting an error message at the top of my page.

Warning: Wrong parameter count for round() in /home6/oakslist/public_html/wp-content/plugins/affiliate/affiliateincludes/addons/supporter.php on line 101

Also, when recording affiliate paid member signups, can it automatically debit each account with the right amount? Seems like i will have to go through each affiliate and debit their account manually. This could be a problem in the case that you get a lot of affiliates pushing your site. Just to clarify, I have it set on 20% in pro-sites. does it only work with a dollar amount?

please advise,
Jonathan