Why is the local Script printing nil for a string that's passed via Script? [ Answered]

FilteringEnabled is on and I'm using RemoteFunctions for this. The argument MapString is a string taken apart from what someone chatted, however when I print it in the Local Script that is waiting to get called on, it's nil for some reason, why is this so?

• Server Script

local ClientFunction = Instance.new("RemoteFunction", game.Workspace)
ClientFunction.Name = "ClientFunction"

game.Players.PlayerAdded:connect(function(Plr)
		Plr.Chatted:connect(function(Msg)
			if string.sub(string.lower(Msg), 0, 9) == "computer " then
				if string.sub(string.lower(Msg), 10, 14) == "load " then
					if game.ReplicatedStorage:FindFirstChild(string.sub(string.lower(Msg), 15)) then
						local MapString = string.sub(string.lower(Msg), 15)
						ClientFunction:InvokeClient(Plr, MapString)
					end
				end
			end
		end)
end)

• Local Script (Client)

local ClientFunction = game.Workspace:WaitForChild("ClientFunction")

function ClientFunction:OnClientInvoke(MapName)
	print(MapName)

end

• Answer bellow

Thanks to M39a9am3R's help, he pointed out that I used a : instead of a . for function ClientFunction:OnClientInvoke(MapName)