index.php not found but it is in the folder

[hups]

hello my site is e107 nad i have a problem i have install phpfreechat and the path is corect but the erro is

phpFreeChat cannot be initialized, please correct these errors:
/is/htdocs/wp1143775_8Z7KQIRTQB/www/e107/e107_plugins/phpfreechat_menu/index.php existiert nicht


my site is http://www.mickmuk.de/e107/

please help me