Trouble running the hello world application

Hello,

I'm having trouble running luabind's hello world application 
(http://www.rasterbar.com/products/luabind/docs.html#hello-world).
My source code including info about my OS, versions and the error 
message: http://pastebin.com/MDt7hzdc
I have luabind installed from Debian testing repos (version 0.9.1).

btw I'm a complete newbie in Lua...
Also, when I replace the greet() call with:
print(f)

the result is:
$ lua test.lua
nil

Don't know if the result should be something different, but my 2 cents 
would be on that it doesn't load the library.

Can anyone help me out? Thanks in advance.

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