SystemMessage will not send?

Hello, Scriptinghelpers / SH. I have been trying to fix this script ChatMakeSystemMessage, but it will not send the System Message, I have tried many solutions like the following:

1: Try multiple scripts 2: Running through both Game and Studio. 3: Messing with the script

I copied the script straight off the wiki IN A LOCALSCRIPT, but it does not work.. Here it is:

game:GetService("StarterGui"):SetCore("ChatMakeSystemMessage",{
    Text = "Welcome to my game!"; -- RChatMakeSystemMessageequired. Has to be a string!
    Color = Color3.new(0,1,1); -- Cyan is (0,255/255,255/255) -- Optional defaults to white: Color3.new(255/255, 255/255, 243/255)
    Font = Enum.Font.SourceSans; -- Optional, defaults to Enum.Font.SourceSansBold
    FontSize = Enum.FontSize.Size24; -- Optional, defaults to Enum.FontSize.Size18
})