WordPress Fails to Start

I was getting a message that there is a critical error in WordPress. I turned on debugging and this is the message I am receiving. Any help would be greatly appreciated.

Warning: require_once(/var/www/html/wp-includes/php-compat/readonly.php): failed to open stream: No such file or directory in /var/www/html/wp-includes/general-template.php on line 4869

Fatal error: require_once(): Failed opening required ‘/var/www/html/wp-includes/php-compat/readonly.php’ (include_path=’.:/usr/share/php’) in /var/www/html/wp-includes/general-template.php on line 4869
There has been a critical error on this website.

The page I need help with: [log in to see the link]