First addon help

[Svein Arne Nilsen <sanilse@...>]

Hi

Im new to lua and wondering if i can get some help.

This is a sampel addon iv pickt up.

local HelloWorld = {} -- the AddOn namespace, all your functions should be
placed inside here instead of as globals.
_G.HelloWorld = HelloWorld -- expose it to the global scope
local frame = _G.HelloWorld_Frame -- made in the XML

--- Print out "Hello, World!" to the chat frame
-- @usage HelloWorld.Print()
function HelloWorld.Print()
   DEFAULT_CHAT_FRAME:AddMessage("Hello, World!")
end

frame:RegisterEvent("VARIABLES_LOADED")                     <--  it stopps
here saying its a nil value

function HelloWorld:OnEvent(event, arg1, arg2, arg3, arg4, arg5, arg6, arg7,
arg8, arg9)
   -- this is a fun trick that will call a method named the event, passing
in all the relevant args.
   self[event](self, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9)
end

function HelloWorld:VARIABLES_LOADED()
   self.Print()
end

any help plz