Warning: require(calendar/calendar.php) [function.require]: failed to open stream: No such file or directory in C:\WWW\news\publish\calendar\demo1.php.bak on line 3

Fatal error: require() [function.require]: Failed opening required 'calendar/calendar.php' (include_path='.;C:\php5\pear') in C:\WWW\news\publish\calendar\demo1.php.bak on line 3