How do I make a brick that turns on GUI?

I'm sorry, this is probably an extremely basic question, but I use the code below with anything else and it works fine, but when i replace what it does with the GUI things, it stops working. Why does this happen?

Noobley = game.StarterGui.ScreenGui.DialogueGUI.Noobley.Text.Double
nExplain = game.StarterGui.ScreenGui.DialogueGUI.Noobley.Text.Double
Double = game.StarterGui.ScreenGui.DialogueGUI.Noobley.Portraits.nExplain
Next = game.StarterGui.ScreenGui.DialogueGUI.Next
Name = game.StarterGui.ScreenGui.DialogueGUI.Name
Text = game.StarterGui.ScreenGui.DialogueGUI.Text

function onTouched(hit)
Noobley.Visible = true --The name
nExplain.Visible = true --The portrait
Double.Visible = true --The text
Next.Visible = true --The next button
Name.Visible = true --The name box
Text.Visible = true --The text box
end 
script.Parent.Touched:connect(onTouched)

@Zenith_Lord is this how I'm supposed to do it? also should i put the part and the gui in the brick?

	Text = script.Parent.Text
	 
	 
	function onTouched(hit)
	    -- A few safety checks
	    if hit and hit.Parent then
	        local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
	        if plr then
	            Text.Parent = plr.PlayerGui
	            -- Whatever other guis you have, parent them to the plr's PlayerGui
	        end
	    end
	end
	 
	script.Parent.Touched:Connect(onTouched)

Put the guis inside the player's PlayerGui. I also indented everything properly:

--[[
 ... (guis here)
]]

function onTouched(hit)
	-- A few safety checks
	if hit and hit.Parent then
		local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
		if plr then
			Noobley.Parent = plr.PlayerGui
			nExplain.Parent = plr.PlayerGui
			-- Whatever other guis you have, parent them to the plr's PlayerGui
		end
	end
end

script.Parent.Touched:Connect(onTouched)