ChatSystemMakeMessage has not been registered by the CoreScripts?

Hello

game:GetService("ReplicatedStorage").sendmsg.OnClientEvent:Connect(function(p,t)
	game.StarterGui:SetCore("ChatSystemMakeMessage", {
		Text = p.Name.." has completed the obby in "..t;
		Font = Enum.Font.SourceSansBold;
		FontSize = Enum.FontSize.Size48;
		Color = BrickColor.new("Black").Color
	})
end)

i have this Localscript placed in StarterPlayerScripts, and it keep giving me the message that ChatSystemMakeMessage has not been registered by the core scripts. i tried putting it in startergui and it didnt work as well. why does the error message keep popping up? how do i fix it? thx for all help

Its not registered, because it errors if the string is not found or registered by Roblox meaning instead of "ChatSystemMakeMessage" its "ChatMakeSystemMessage"!!