Checking the plugin source code it seems to me that on line 82 of the file includes/class-editorskit-responsive-preview.php there is one comma too many in the wp_register_style() function.
I think removing it is enough to fix the problem.
Dan
This reply was modified 2 years, 12 months ago by dueper.
Bump!
Same here, if I’ve understood well. I need some price “clusters”, and at the moment I can only use the draggable filter, which is pretty ok, but that’s not what want.