Error Messages When Shortcode added to WordPress

After adding the shortcode for this plug-in onto a page, it generates the following errors in the backend of the site anytime the page is updated:

Warning: array_map(): Expected parameter 2 to be an array, null given in /home/customer/www/branddentistry.com/public_html/wp-content/plugins/ba-plus-before-after-image-slider-free/admin.php on line 124

Warning: Invalid argument supplied for foreach() in /home/customer/www/branddentistry.com/public_html/wp-content/plugins/ba-plus-before-after-image-slider-free/admin.php on line 125

Warning: Cannot modify header information – headers already sent by (output started at /home/customer/www/branddentistry.com/public_html/wp-content/plugins/ba-plus-before-after-image-slider-free/admin.php:124) in /home/customer/www/branddentistry.com/public_html/wp-admin/post.php on line 231

The page I need help with: [log in to see the link]