Error "attempt to call a nil value"

[BlueBloxBlast]

I want to make a function that when it is called, it plays a tween. I got an error that says “attempt to call a nil value” and couldn’t find a fix. Does anyone know how to fix it?

The script is a script for backpacks in simulators. Where currentBlocks is collected and maxBlocksValue is how much the backpack can hold.(They are both IntValues)

currentBlocks:GetPropertyChangedSignal(“Value”):Connect(tw)

if currentBlocks.Value >= maxBlocksValue.Value then
tw() -------------------------------------------------------------------This is where I get the error
end

function tw()
if currentBlocks.Value >= maxBlocksValue.Value then
gui.Visible = true
print(“a”)

  local TS = game:GetService("TweenService")
  local Info = TweenInfo.new(
  	2,
  	Enum.EasingStyle.Cubic,
  	Enum.EasingDirection.InOut,
  	-1,
  	true,
  	0
  )
  local tween = TS:Create(gui.Arrow, Info, {Position = UDim2.new(-0.666, 0,-0.283, 0)})
  while wait() do
  	tween:Play()
  	tween.Completed:Wait()
  	if gui.Visible == false then
  		break
  	end
  end

end
end

[FriezaShouldHaveWon (Asad)]

Can i see the script? Makes it easier to deduce what the issue is

[ObviouslyGreen (Green)]

Are you expecting me to read your thoughts

You should provide the script you tested so we can actually help

[BlueBloxBlast]

@ObviouslyGreen
@FriezaShouldHaveWon
I edited the post. The script should be on it right now.

[ObviouslyGreen (Green)]

You should define the tw function before you try to call it, so move it higher than the tw(). Probably at the very top of your script somewhere.

[BlueBloxBlast]

Thanks! But I’m confused why wouldn’t it work the original way I tried it?

[ObviouslyGreen (Green)]

Because you’d be calling a function that doesn’t exist yet. You have to make sure the function exists before you try to call it.