XF2 Style Fury 2.3.7

the theme just leaves a blank page on the site only thing you see is white. such a shame this theme seems nice but since it does not work..

Hi! The style is really great, I just get the following error when I try to turn on the extra footer, what could be the problem? Is there a solution?
Template public:extra_footer error: No widget defined member_wrapper_newest_members src/XF/SubContainer/Widget.php:85

not working properly