DNS server: could not configure root hints from

[wprauchholz]

When trying to start named I am gettign the following error:

Dec 9 21:19:02 home named[27224]: listening on IPv4 interface lo, 127.0.0.1#53
Dec 9 21:19:02 home named[27224]: listening on IPv4 interface eth1, 192.168.20.1#53
Dec 9 21:19:02 home named[27224]: generating session key for dynamic DNS
Dec 9 21:19:02 home named[27224]: could not configure root hints from 'named.ca': file not found
Dec 9 21:19:02 home named[27224]: loading configuration: file not found
Dec 9 21:19:02 home named[27224]: exiting (due to fatal error)

I googled quite a bit and searched also in this forum, but have not found the solution yet. Can you help?
This is the config file

options {
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
/*
* If there is a firewall between you and nameservers you want
* to talk to, you might need to uncomment the query-source
* directive below. Previous versions of BIND always asked
* questions using port 53, but BIND 8.1 uses an unprivileged
* port by default.
*/
query-source address * port 53;
listen-on { 127.0.0.1; 192.168.20.1; };
allow-query { 127.0.0.1; 192.168.20.0/24; };
forward first;
forwarders { 194.224.52.37; 194.179.1.100; };
};
zone "." IN {
type hint;
file "named.ca";
};
zone "theragafamily.com" IN {
type master;
file "data/master-theragafamily.com";
allow-update { none; };
};

zone "20.168.192.in-addr.arpa" IN {
type master;
file "data/reverse-192.168.20";
allow-update { none; };
};
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

These are hte locations of the named.ca file

/usr/share/doc/bind-9.7.4/sample/var/named/named.ca
/var/named/named.ca
/var/named/data/named.ca


Thanks

[wprauchholz]

I eliminated the following part from the config file:
zone "." IN {
type hint;
file "named.ca";
};

And now I can start named and at least from the server can even surf the web (elinks).

What need I named.ca for?
named.ca is /etc /etc/var/named and I pointed the config file to it, but still I get htis error message. Any ideas?