trying to mess around with the roblox lua chat and i cant even get this to work?

local util = require(script.Parent:WaitForChild("Util"))
 
function ProcessMessage(message, ChatWindow, ChatSettings)
	if string.sub(message, 1, 5) == "/last" then
		local currentChannel = ChatWindow:GetCurrentChannel()
		if (currentChannel) then
			currentChannel:RemoveLastMessageFromChannel()
		end
		return true
	end
	return false
end
 
return {
	[util.KEY_COMMAND_PROCESSOR_TYPE] = util.COMPLETED_MESSAGE_PROCESSOR,
	[util.KEY_PROCESSOR_FUNCTION] = ProcessMessage
}

this doesnet work and i pulled it right out of the freaken roblox wiki. i put this module inside messagecreatormodule like it said aswell