.php Error Breaking my Site

When logging on to lunaphilly.com this message is received:

Warning: require(/home/lunaphil/public_html/wp-includes/version.php): failed to open stream: Permission denied in /home/lunaphil/public_html/wp-settings.php on line 30

Fatal error: require(): Failed opening required ‘/home/lunaphil/public_html/wp-includes/version.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/lunaphil/public_html/wp-settings.php on line 30

Backend does not work either. WordPress novice. Anything helps!!