I don't get that error at all on my dev board, but if you want you can do this file edit so it doesn't come up at all...
Open add_site.php:
Find (all of these):
PHP Code:
unlink("images/toplist/buttons/sites/".$key);
Replace With (some already have the @, only do it for the ones that dont):
PHP Code:
@unlink("images/toplist/buttons/sites/".$key);
Also, I haven't had a chance to update the CMPS module, I will have a new version out soon to have that option supported.
Derek