Warning: require(C:\Sites\tasc/wp-includes/class-wp-user.php): failed to open stream: No such file or directory in C:\Sites\tasc\wp-settings.php on line 127

Fatal error: require(): Failed opening required 'C:\Sites\tasc/wp-includes/class-wp-user.php' (include_path='.;C:\php\pear') in C:\Sites\tasc\wp-settings.php on line 127