SetCore: ChatMakeSystemMessage not working?

I am trying to send a message to the chat. The following code is in a LocalScript in StarterGui:

function game.Workspace.RemoteFunction.OnClientInvoke(killer, player)
	game:GetService("StarterGui"):SetCore("ChatMakeSystemMessage",{
	    Text = (killer.Name .. " killed " .. player.Name);
	    Color = killer.TeamColor;
	})
end

However, whenever it runs I get the following error:

SetCore: ChatMakeSystemMessage has not been registered by the CoreScripts

I did exactly what the wiki page said, but obviously it's not working. What am I doing wrong?

I belive you didn't use the full table.

As the wiki says, you should include font and font size.

Lets say to make this size 18px and bold, we would,

game:GetService("StarterGui"):SetCore("ChatMakeSystemMessage",{ 
	Text = "Your data has been saved";
	Color = Color3.new(0/255, 128/255, 0/255); 
	Font = Enum.Font.SourceSansBold;
	FontSize = Enum.FontSize.Size18;
})

And in your case,

function game.Workspace.RemoteFunction.OnClientInvoke(killer, player)
	game:GetService("StarterGui"):SetCore("ChatMakeSystemMessage",{
		Text = (killer.Name .. " killed " .. player.Name);
		Color = killer.TeamColor;
		Font = Enum.Font.SourceSansBold; --If you want it bold
		FontSize = Enum.FontSize.Size18;
	})
end

Hope I helped!

TheHospitalDev

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