Script in StarterGui not working, errors show up in output as nil value?

this code is inside a gui, and it worked perfectly, but now it just dosent for some reason without change. it says the the part name is a nil value despite it being in workspace, and I know I named it right, I literally copy and pasted the name straight from the part to put into this script. heres the script: (just to clarify, this is only happening with the 3rd line, aka the part.touched thing.)

local part = game.workspace:FindFirstChild("Beggining")

part.Touched:Connect(function(hit)
if hit.Parent:FindFirstChild("Humanoid") then

  

script.Parent.Parent.Enabled= true
wait(5)
script.Parent.Parent.Enabled = false
end
end)

local part = workspace:FindFirstChild("Why")

part.Touched:Connect(function(hit)
if hit.Parent:FindFirstChild("Humanoid") then

wait(1)

  

script.Parent.Parent.Enabled= true
wait(5)
script.Parent.Parent.Enabled = false
end

  

end)

  

local part = workspace:FindFirstChild("YES")

part.Touched:Connect(function(hit)
if hit.Parent:FindFirstChild("Humanoid") then

wait(1)

script.Parent.Text.Text = "TEST"
script.Parent.Text2.Text = "TEXT"  

script.Parent.Parent.Enabled= true
wait(5)
script.Parent.Parent.Enabled = false  

end
end)

Improvements

Use a Local Function since the change between the events is practically the same

Use WaitForChild() to make sure an instance exists before using it

Use Local Variables for instances which you want to call multiple times throughout the script

Issues

You're using multiple local variables with the same name, causing them to overwrite each other, instead, name them differently.

If you use FindFirstChild() you should also be checking that the returned value is not nil

Revised LocalScript

local frame = script.Parent
local gui = frame.Parent

local part1 = workspace:WaitForChild("Beggining")
local part2 = workspace:WaitForChild("Why")
local part3 = workspace:WaitForChild("YES")

local function Enabler(hit, check)
	if hit and hit.Parent and game:GetService("Players"):GetPlayerFromCharacter(hit.Parent) then
		if check == 2 or check == 3 then
			wait(1)
			if check == 3 then
				frame:WaitForChild("Text").Text = "TEST"
				frame:WaitForChild("Text2").Text = "TEXT" 
			end
		end

		gui.Enabled= true
		wait(5)
		gui.Enabled = false
	end
end

part1.Touched:Connect(function(hit)
	Enabler(hit, 1)
end)

part2.Touched:Connect(function(hit)
	Enabler(hit, 2)
end)

part3.Touched:Connect(function(hit)
	Enabler(hit, 3)
end)