Upgraded from free to pro – WARNING: Creating default object from empty value

Hi, I've just upgraded to Catch Fullscreen Pro and on activation the following warning displayed and continues to display: Warning: Creating default object from empty value in /home/deepsumm/public_html/chalicewellmanypathsonesourcefestival.org/wp-content/themes/catch-fullscreen-pro/inc/customizer/featured-content.php on line 66 featured-content.php line 66 reads - $wp_customize->get_section( 'featured_content' )->active_callback = 'catch_fullscreen_is_featured_tag_content_active'; I have almost no experience with coding so any help would be gratefully received. Thanks :-)