Lighttpd

$HTTP["host"] == "www.mysite.org" {
server.document-root = "/usr/home/Mysite/public_html/"
server.error-handler-404 = "/index.php?error=404" }
}

OR

$HTTP["url"] == "^mysite\.org" {
server.document-root = "/usr/home/Mysite/public_html/"
server.error-handler-404 = "/index.php?error=404" }

How to repair or setup correct values?
}

after restart lighttpd I saw error:

YYYY-MM_DD H:M:S (configfile.c.1156) a default document-root has to be set
YYYY-MM_DD H:M:S (server.c.580) setting default values failed