DNS 配置出错信息zone configuration for '.' failed: file not found 高手请进来

fabout

/var/log/messages 信息
Oct 15 16:31:37 linux named[1666]: starting BIND 9.1.3 -u named
Oct 15 16:31:37 linux named[1666]: using 1 CPU
Oct 15 16:31:38 linux named: named startup succeeded
Oct 15 16:31:38 linux named[1669]: loading configuration from '/etc/named.conf'
Oct 15 16:31:38 linux named[1669]: zone configuration for '.' failed: file not found
Oct 15 16:31:38 linux named[1669]: loading configuration: failure
Oct 15 16:31:38 linux named[1669]: exiting (due to fatal error)

/etc/named.conf信息
# Generated automatically by bindconf, alchemist et al.
controls {
        inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};

include "/etc/rndc.key";

options {
        directory "/var/named/";
};







zone  "." {
        type hint;
        file  "named.ca";
};


zone  "0.0.127.in-addr.arpa" {
        type master;
        file  "0.0.127.in-addr.arpa.zone";
};


zone  "localhost" {
        type master;
        file  "localhost.zone";
};
zone  "linuxsir.cn" {
        type master;
        file  "linuxsir.cn.zone";
};

出错消息是说zone configuration for '.'  但是'.'是有的，请教？？？