nse error

[Verde Denim <tdldev () gmail com>]

/usr/share/nmap/nse_main.lua:276:
/usr/share/nmap/scripts/oracle-enum-users.nse:38: attempt to call field
'silent_require' (a nil value)
stack traceback:
    [C]: in function 'assert'
    /usr/share/nmap/nse_main.lua:276: in function 'new'
    /usr/share/nmap/nse_main.lua:466: in function 'get_chosen_scripts'
    /usr/share/nmap/nse_main.lua:766: in main chunk
    [C]: ?

What am I doing wrong here?
I'm running nmap 5.21 on Ubuntu 11.04 64 bit.
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