Based on the reference file link https://rootlayer.net/wp-includes/js/jquery/jquery.js?ver=1.12.4
the file has in the wp-includes folder. So, it’s all about your server or WordPress issue. That’s why the issue directly referred you to contact your web hosting provider for assistance.
This is because the theme and plugins were installed in the wp-content folder, not wp-includes folder.
Thanks for your understanding.
Please extend your support before asking more questions.
Best Regards,
ThemeLooks Support Team