Error Updating Upfront

I've been getting the following error before and after updating my Upfront themes. It shows when you activate the theme and view the site and even in preview mode. Not sure how to fix it. This is the main site of a multi-site, if that matters.

Warning: require_once(servers/class_upfront_ajax.php): failed to open stream: No such file or directory in /home/[username]/[sitename]/wp-content/themes/upfront/library/class_upfront_server.php on line 98

Fatal error: require_once(): Failed opening required 'servers/class_upfront_ajax.php' (include_path='.:disappointed:usr/local/lib/php:disappointed:usr/local/php5/lib/pear') in /home/[username]/[sitename]/wp-content/themes/upfront/library/class_upfront_server.php on line 98