Fatal Error

Warning: require_once(C:\wamp\www\portal\administrator\components\com_banners\helpers\banner.php) [function.require-once]: failed to open stream: No such file or directory in C:\wamp\www\portal\modules\mod_banners\helper.php on line 17

Fatal error: require_once() [function.require]: Failed opening required 'C:\wamp\www\portal\administrator\components\com_banners\helpers\banner.php' (include_path='.;C:\php5\pear') in C:\wamp\www\portal\modules\mod_banners\helper.php on line 17

Erro de php aqui quando vou entrar na página principal.