error with custom sidebars pro

Hi,

I'm getting an error reported and the sidebar replacement is not working reliably..for custom sidebars pro

In the actual widget area if for example I add a text widget (or any other widget) to any sidebar - existing or newly created, I get:

Warning: Missing argument 2 for apply_filters(), called in /mnt/data/home/20739-11273.cloudwaysapps.com/xpswdgrght/public_html/wp-content/plugins/custom-sidebars/inc/class-custom-sidebars-visibility.php on line 531 and defined in /mnt/data/home/20739-11273.cloudwaysapps.com/xpswdgrght/public_html/wp-includes/plugin.php on line 177

This also happens on a local install - same error.

Plugin version is 2.1.0.6

on a 4.2.2 WP and with few other plugins running at least on the local install and the fault remains with 2015 theme activated and only the customs sidebars pro plugin active...so it does not appear to be theme related or a plugin conflict...

can you advise..

thanks,

iain