Typewritting effect script in gui not working?

I made a script that basically types out what I want it to say like a typewriter, but it doesn't seem to work. All the script does is make the text show. I can't find out why though. I've already looked in output multiple times. Here's my script. Thanks for the help!

local text = "Hello! Welcome to Mafia. My code name is The Terminarrator, but you can call me Victor. I'll be narrating every round!"
for i = 1, #text do
    script.Parent.VD.Text = string.sub(text, 1, i)
end