Problem running Nmap

[Neminath <neminath.jain () gmail com>]

I m new to Nmap and to linux rather 
have the following problem running Nmap scanner 


nmap -O x.x.x.x 
when i run the above command i get the following (infact for all the
commands)

Starting Nmap 4.20 ( http://insecure.org ) at 2008-07-06 11:46 IST 
mass_dns: warning: Unable to open /etc/resolv.conf. Try using --system-dns
or specify valid servers with --dns-servers 
mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is
disabled. Try using --system-dns or specify valid servers with --dns_servers 
Note: Host seems down. If it is really up, but blocking our ping probes, try
-P0 
Nmap finished: 1 IP address (0 hosts up) scanned in 0.171 seconds 

whats this message is all about how do i resolve it . 

Regards 
Neminath 


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