How would I make this Button work? It will not make login screen not visible

Login script: (doesnt work)

local user = script.Parent.Parent.Parent.Parent.User.Value -- String Value
local pass = script.Parent.Parent.Parent.Parent.Pass.Value -- String Value
local username = script.Parent.Parent.User -- TextBox
local password = script.Parent.Parent.Pass -- TextBox

script.Parent.MouseButton1Click:connect(function()
	if username.Text == user and password.Text == pass then
		script.Parent.Parent.Parent.Visible = false -- Login Screen
	end
end)

Register script: (Works)

local user = game.StarterGui.ScreenGui.User
local pass = game.StarterGui.ScreenGui.Pass

script.Parent.MouseButton1Click:connect(function()
	if script.Parent.Parent.UserName.Text ~= nil and script.Parent.Parent.Password.Text ~= nil and script.Parent.Parent.Age.Text ~= nil then
		user.Value = script.Parent.Parent.UserName.TextBox.Text
		pass.Value = script.Parent.Parent.Password.TextBox.Text
		script.Parent.Parent.Parent.Visible = false
		script.Parent.Parent.Parent.Parent.Login.Visible = true
	end
end)