how to add some scripts from NSE to nmap?

[Alex <pppsss7 () gmail com>]

I want' scan my mysql server
nmap -sV --script=mysql-empty-password xx.xx.142.106

but i see this:

Starting Nmap 5.00 ( http://nmap.org ) at 2010-04-18 09:53 MSD
NSE: failed to initialize the script engine:
/usr/share/nmap/nse_main.lua:390: 'mysql-empty-password' did not match a
category, filename, or directory
stack traceback:
        [C]: in function 'error'
        /usr/share/nmap/nse_main.lua:390: in function 'get_chosen_scripts'
        /usr/share/nmap/nse_main.lua:594: in main chunk
        [C]: ?


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