Chido.. localhost is down

bash# nmap -sS -v -O localhost
WARNING!  The following files exist and are readable: /usr/local/share/nmap/nmap-os-fingerprints and ./nmap-os-fingerprints.  I am choosing /usr/local/share/nmap/nmap-os-fingerprints for security reasons.  set NMAPDIR=. to give priority to files in your local directory

Starting nmap 3.48 ( http://www.insecure.org/nmap/ ) at 2003-11-29 16:37 CST
WARNING!  The following files exist and are readable: /usr/local/share/nmap/nmap-services and ./nmap-services.  I am choosing /usr/local/share/nmap/nmap-services for security reasons.  set NMAPDIR=. to give priority to files in your local directory
Host 127.0.0.1 appears to be down, skipping it.
Note: Host seems down. If it is really up, but blocking our ping probes, try -P0
Nmap run completed -- 1 IP address (0 hosts up) scanned in 13.008 seconds