lua is not intalled in my board

RouterOS Scripting
1

hiii all
i try

[admin@MikroTik] > [/lua "local f=assert(io.open('/test.txt', 'w+')); f:write(newContent); f:close()" ];
bad command name lua (line 1 column 3)

[admin@MikroTik] > [:lua "require 'customprint'\n print('hello from custom print function')"]    
syntax error (line 1 column 32)

i create the “/lua” folder in files and have the file “customprint.lua” same this url:
http://wiki.mikrotik.com/wiki/Scripting-examples#Include_custom_function_in_another_script

how can fix this problen ???

2

Lua support was dropped on v4.0rc1, but apparently they are planning to bring it back at some point.