[function.require]: ERROR

Hello — my page at https://paramustheatre.org/phs/ is giving me an error all of the sudden ??

Here is what it says …

Warning: require(/home/www/paramustheatre.org/phs/wp-includes/functions.php) [function.require]: failed to open stream: Permission denied in /home/www/paramustheatre.org/phs/wp-settings.php on line 69

Fatal error: require() [function.require]: Failed opening required ‘/home/www/paramustheatre.org/phs/wp-includes/functions.php’ (include_path=’.:/usr/local/php5/lib/php’) in /home/www/paramustheatre.org/phs/wp-settings.php on line 69

Does anyone have any suggestions?