Upgrade to 2.7.1 unsuccessful

I get the following error and am unable to access anything on my site after upgrading. All previous upgrades have gone flawlessly, so I’m not sure what to do here. Any help appreciated.

Ray

This is the error I receive:

Fatal error: require() [function.require]: Failed opening required ‘/home/.sites/29/site109/web/wp-includes/compat.php’ (include_path=’.:/home/php/lib/pear’) in /home/.sites/29/site109/web/wp-settings.php on line 238