AceLibrary.lua:82: attempt to index local `self' (a string value)

BulkMail.lua
------------
local L = AceLibrary("AceLocale-2.0"):new("BulkMail")


AceLibrary.Lua
--------------
	if getmetatable(self) and getmetatable(self).__tostring then

		message = string.format("%s: %s", tostring(self), message)

	elseif type(self.GetLibraryVersion) == "function" and AceLibrary:HasInstance(self:GetLibraryVersion()) then
 --LINE 82
		message = string.format("%s: %s", self:GetLibraryVersion(), message)

	elseif type(self.class) == "table" and type(self.class.GetLibraryVersion) == "function" and AceLibrary:HasInstance(self.class:GetLibraryVersion()) then

		message = string.format("%s: %s", self.class:GetLibraryVersion(), message)

	end