Fatal error – Combrite

I am getting this error on the combrite event page

Fatal error: Cannot use object of type WP_Error as array in /home/USER/SITE.com/wp-content/plugins/combrite/front/combrite_add_ticket_and_map_widgets_to_post.php on line 11

http://pancakesinthepark.org/

Any ideas on why?

Ideas on how to fix?

Thank you

https://wordpress.org/plugins/combrite/