We are having this come up on our site (cyclelike.com)

We are having this come up on our site (cyclelike.com) and wonder if you could help us fix it:
Warning: Missing argument 2 for apply_filters(), called in /home3/guzzba/public_html/wp-content/plugins/custom-sidebars/inc/class-custom-sidebars-visability.php on line 531 and defined in /home3/guzzba/public_html/wp-includes/plugin.php on line 77

Many thanks.
Claire
cyclelike.com
(claire@teddermain.com)