настроил lighttpd. становил sqlite. установил php как fast-cgi.

пытаюсь сделать что-нибудь с sqlite из php

$db = new sqlite_db("db.sqlite");

получаю:

500 - Internal Server Error

в логах (error.log) lighttpd только это:

2008-07-11 15:01:28: (mod_fastcgi.c.1743) connect failed: Connection refused on unix:/home/www/php-fcgi.sock-0
2008-07-11 15:01:28: (mod_fastcgi.c.2912) backend died; we'll disable it for 5 seconds and send the request to another backend instead: reconnects: 0 load: 1
2008-07-11 15:01:34: (mod_fastcgi.c.2725) fcgi-server re-enabled: unix:/home/www/php-fcgi.sock-0
2008-07-11 15:01:41: (mod_fastcgi.c.1743) connect failed: Connection refused on unix:/home/www/php-fcgi.sock-0
2008-07-11 15:01:41: (mod_fastcgi.c.2912) backend died; we'll disable it for 5 seconds and send the request to another backend instead: reconnects: 0 load: 1
2008-07-11 15:01:41: (mod_fastcgi.c.3524) all handlers for  /index.php on .php are down.
2008-07-11 15:01:47: (mod_fastcgi.c.2725) fcgi-server re-enabled: unix:/home/www/php-fcgi.sock-0
[root@begemot_router root]$

пните пожалуйста, куда копать?