Did you made any code customization in the theme? There is already available wp_footer(); in footer.php file. So i don’t think there is any issue. I think you are customizing the code so you are getting an issue. Please download a fresh copy of our theme and delete old version and re add it again.
We cannot guarantee that third party plugins will work with our theme and also there are a lots of plugins so you need to hire a developer.
I have just check it and there is already available wp_footer(); functions in footer.php. You can check it from your end too. Open footer.php file. On line no 49 there is wp_footer(); just before these two tags