Nmap Script Updatedb

After adding a custom NSE script and updating nmap database, the following error was shown. My nmap was installed from Mac OS X Binary from nmap.org.

$ nmap --script-updatedb
Starting Nmap 6.25 ( http://nmap.org ) at 2013-03-29 00:40 SGT
NSE: Updating rule database.
NSE: Failed to load /usr …