LocalScript not a valid member of PlayerGui in FE?

Ok, I have a local script in StarterGui called 'HoldF'. And then in a tool in StarterPack, I have a script that is trying to access it.

local lscr = plr.PlayerGui:WaitForChild('HoldF', 2)

However, it just returns nil. I've tried using it infinitely, but it returns 'infinite yield possible' and I've tried normally, PlayerGui.HoldF but none of these seem to work.

When I went into the game and went to the developer console, I typed

game.Players.Scaii_0.PlayerGui.HoldF.Disabled = false

But even this said, HoldF is not a valid member of PlayerGui.

Does anyone know what the problem is?

You should change it to

game.Players["Scaii_0"].PlayerGui.HoldF.Disabled = false