Hello,
Your site under maintenance mode, so I can’t check it.
Please, make sure you have checked all the server requirements before the installation https://www.8theme.com/documentation/xstore/theme-installation/xstore-theme-requirements/
Also, versions of required plugins should be latest https://www.8theme.com/documentation/xstore/plugins/plugins-update/
Provide us with temporary wp-admin access so we can take a closer look.
Regards