Custom Sidebars Pro 'Warning' Message

Hi!

I've been using your plugins on other sites with fantastic results! I'm working on a temporary URL and I just had a 'Warning' message appear in the custom sidebars that I create.

Below is the message:

Warning: Missing argument 2 for apply_filters(), called in /home/content/p3pnexwpnas06_data03/00/2321500/html/wp-content/plugins/custom-sidebars/inc/class-custom-sidebars-visibility on line 531 and defined in /home/content/p3pnexwpnas06_data03/00/2321500/html/wp-includes/plugin.php on line 177

This message does not appear in the default theme sidebars. We can only display the default theme sidebars on the front-end as well. When I set up a custom sidebar, the sidebar area is empty!

Is there anything I can do to fix it?

Thank you so much and cheers!