I get error: "Attempt to call a nil value" How do i fix?

What I'm thinking your hiearchy is like Doors -->> Script, Door-->>ClickDetector, Door2-->ClickDetector Since you are new to scripting here is an important thing What you did originally was that you called the function before even saying what the function is so thats why its saying "error attempt to call a nil value" It's like somebody saying "Do your homework" even though the teacher didn't assign homework, same thing here with functions As you can see I changed connect to Connect Well connect is depricated If something is depricated, then you can't use something recent with it Thats why I reccommend using Connect instead of connect I added a few variables to make it more easier to read Plus I don't like using transparency I used for loops to make a door animation

local fullModel = script.Parent
local door1 = fullModel.Door1
local click1 = door1.ClickDetector
local door2 = fullModel.Door2
local click2 = fullModel.ClickDetector
function Door1Open()
  	for openDoor = 0,90.0.1 do
		door1.Orientation = Vector3.new(0,openDoor,0) -- Simple animation
		wait()
	end
end

function Door2Open()
   for openDoor2 = 0,90.0.1 do
		door1.Orientation = Vector3.new(0,openDoor2,0) -- Simple animation
		wait()
	end
end

function Door1Close()
    for closeDoor = 90,0,-0.1 do 90 + (-0.1) is the same thing as 90 - 0.1
		door1.Orientation = Vector3.new(0,closeDoor,0) -- Simple animation
	end
end

function Door2Close()
   	  for closeDoor2 = 90,0,-0.1 do 90 + (-0.1) is the same thing as 90 - 0.1
		door2.Orientation = Vector3.new(0,closeDoor,0) -- Simple animation
	end
end
click1.MouseClick:Connect(Door1Open)
click2.MouseClick:Connect(Door2Open)
click1.MouseClick:Connect(Door1Close)
click2.MouseClick:Connect(Door2Close)

If you have no knowledge about loops then I reccommend you to learn it right away Loops are very important Anyway If this answer worked then, Please submit it