How to enable error log in lighttpd properly

I have a Centos 5 system with Lighttpd and fastcgi enabled.
It does log access but does not log errors. I have Internal Server Error 500 and no info in log and when I try to open not -existing file also – no info in error log. How to enable it properly?

Below is list of modules that I've enabled:

server.modules              = (
                               "mod_rewrite",
                               "mod_redirect",
                               "mod_alias",
#                                "mod_access",
#                               "mod_cml",
#                               "mod_trigger_b4_dl",
#                               "mod_auth",
                               "mod_status",
                               "mod_setenv",
                               "mod_fastcgi",
#                               "mod_webdav",
#                               "mod_proxy_core",
#                               "mod_proxy_backend_fastcgi",
#                               "mod_proxy_backend_scgi",
#                               "mod_proxy_backend_ajp13",
#                               "mod_simple_vhost",
#                               "mod_evhost",
#                               "mod_userdir",
#                               "mod_cgi",
#                               "mod_compress",
#                               "mod_ssi",
#                               "mod_usertrack",
#                               "mod_expire",
#                               "mod_secdownload",
#                               "mod_rrdtool",
                                "mod_accesslog" )

Here are setting of debugging:

## enable debugging
#debug.log-request-header     = "enable"
#debug.log-response-header    = "enable"
#debug.log-request-handling   = "enable"
debug.log-file-not-found     = "enable"
#debug.log-condition-handling = "enable"

Setting of path to error and access log:

## where to send error-messages to
server.errorlog             = "/home/lxadmin/httpd/lighttpd/error.log"

#### accesslog module
accesslog.filename          = "/home/lxadmin/httpd/lighttpd/ligh.log"

Settings of fastcgi:

fastcgi.debug = 1

fastcgi.server = ( ".php" => ((
                     "bin-path" => "/usr/bin/php-cgi",
                     "socket" => "/tmp/php.socket",
                     "max-procs" => 12,
                     "bin-environment" => (
                         "PHP_FCGI_CHILDREN" => "2",
                         "PHP_FCGI_MAX_REQUESTS" => "500"
                         )
                 )))

And in included config file I have:

server.errorlog    =  "/home/httpd/mywebsite.com/stats/mywebsite.com-error_log"

What comes to log files:

/home/httpd/mywebsite.com/stats/
-rw-r--r-- 1 apache apache 5173239 May 16 11:34 mywebsite.com-custom_log
-rwxrwxrwx 1 root   root         0 Mar 27  2009 mywebsite.com-error_log

/home/lxadmin/httpd/lighttpd/
-rwxrwxrwx  1 apache apache    2184 Apr 22 22:59 error.log
-rwxrwxrwx  1 apache apache 6088621 May 16 11:26 ligh.log

I gave error logs chmod 777 for a try to check if it's the issue, but apparently it's not.

So my question is: what to do to have error log enabled?