Warning: require_once(core.php): failed to open stream: No such file or directory in C:\inetpub\wwwroot\mantis\core\timeline_inc.php on line 17

Fatal error: require_once(): Failed opening required 'core.php' (include_path='.;C:\php\pear') in C:\inetpub\wwwroot\mantis\core\timeline_inc.php on line 17