What does this error message mean?
Failed opening required '/Applications/XAMPP/xamppfiles/htdocs/moodle18/blocks/extrafields/admin_user.php'

I got it while I updated Moodle 1.8.11 today. The full error text is the following. I updated Moodle 1.8.11 via CVS.

Warning: require_once(/Applications/XAMPP/xamppfiles/htdocs/moodle18/blocks/extrafields/admin_user.php) [function.require-once]: failed to open stream: No such file or directory in /Applications/XAMPP/xamppfiles/htdocs/moodle18/admin/user.php on line 435

Fatal error: require_once() [function.require]: Failed opening required '/Applications/XAMPP/xamppfiles/htdocs/moodle18/blocks/extrafields/admin_user.php' (include_path='.:/Applications/xampp/xamppfiles/lib/php') in /Applications/XAMPP/xamppfiles/htdocs/moodle18/admin/user.php on line 435