Fatal error usig slider and carousel

I am try to use Fatal error usig slider and/or carousel selecteng category.
I have this error:
Fatal error: Cannot use object of type WP_Error as array in /Applications/MAMP/htdocs/testmu/wp-content/plugins/shortcodes-ultimate/inc/core/shortcodes.php on line 1021

I hope your resolve it.
Thanks

https://wordpress.org/plugins/shortcodes-ultimate/