[Plugin: WP-SNAP!] Problem with plugin Role Scoper

Hi i have a problem with WP-SNAP and the pluging Role Scoper. the problem is that when i am logged of role scooper throws the following error:

Warning: Missing argument 2 for QueryInterceptor_RS::flt_posts_request() in /home/jvs512/carta/wp-content/plugins/role-scoper/query-interceptor_rs.php on line 118

And if I’m logged in as any user, that error disappear!

i though it was an role scoper problem but if i remove the line code:
<?php if (function_exists('wp_snap')) { echo wp_snap(); } ?>
the error disappear!