Subdomain - 404 (PHP FPM)

I've setup a subdomain but when I try to access it… there is my 404 page…

Here is my log error :

Code:

[Fri Oct 04 10:23:13 2013] [error] [client 109.129.179.129] File does not exist: /var/www/clients/client3/web189/web/webmail/php5-fcgi

I'm using PHP-FPM

An idea where that come from ?

Thanks