GetWorld parameter mismatch

[heroldini]

hi,

i try to learn lua and write plugins

now i have the first question:

i use this function:

function OnPlayerRightClick(Player)
	local Welt = cRoot:GetWorld("world")
	Player:SendMessage(Welt:GetName())
end

And get this error:

Code:

Warn [10:15:58] LUA: Plugins/test2/main.lua:46: error in function 'GetWorld'.
argument #1 is 'class cRoot'; 'cRoot' expected.

Warn [10:15:58] Stack trace:
Warn [10:15:58]   [C](-1): GetWorld
Warn [10:15:58]   Plugins/test2/main.lua(46): (no name)
Warn [10:15:58] Stack trace end
Warn [10:15:58] Error in plugin test2 calling function <callback>()

but i have no idea why?

The API-doc says:

Returns the cWorld object of the given world. It returns nil if there is no world with the given name.

Did the "WorldName" mean not a string? Or whats wrong with me?
Can anyone help me?