ChatMakeSystemMessage has not been registered by the Core Scripts. Any help?

I made this script that if there are not atleast five players in the game, this would be in the text..

	while true do
	if game.Workspace.PlayerCount.Players.Value <= 5
		then
		game.StarterGui:SetCore("ChatMakeSystemMessage", {
	    Text = "Waiting for at least FIVE players to join..",
	    Color = Color3.new(196, 40, 28),
	    Font = Enum.Font.Arial,
	    FontSize = Enum.FontSize.Size24,
	print("made it here lol")
		})
		wait(10)
		end
	end

however, this error pops up https://gyazo.com/548ea005d9c5e636a86935643d556c21

any ideas?

The print function is not to be in the SetCore function.

-- Here's a fix

game.StarterGui:SetCore('ChatMakeSystemMessage, {
       Text = 'Waiting for atleast five players to join';
       Color = Color3.new(196/255, 40/255, 28/255);
       Font = Enum.Font.Arial;
       FontSize = Enum.FontSize.Size24;
})