[SOLVED BY ME]Code inside function not firing?

I have been working on this piece of code, and I've come accross a bug, I believe. Here's the script.

local CompletedStage3 = false
script.Parent.Text = " "
Humanoid.WalkSpeed = 16
Humanoid.JumpPower = 50
workspace.Stage3KeycardPart.Success.Changed:Connect(function()
    if workspace.Stage3KeycardPart.Success.Value == true then
        CompletedStage3 = true
        for i = 1,#SuccessStage3 do
            script.Parent.Text = string.sub(SuccessStage3,1,i)
            workspace.Typing:Play()
            wait()
        end
    else
        CompletedStage3 = true
        for i = 1,#FailureStage3 do
            script.Parent.Text = string.sub(FailureStage3,1,i)
            workspace.Typing:Play()
            wait()
        end
    end
end)
if CompletedStage3 == true then
    print("completed")
end

It is supposed to work, and it shows nothing in the output. No warnings, errors or prints. Any help please?