How to make a GUI move animation? It keeps giving me the error: "Scale cannot be assigned to"

I'm trying to make my GUI move. But it always tells me "Scale cannot be assigned to". IDK why cuz it should work right? Here's my code:

local minibar = script.Parent

function show()
    while (minibar.Position.X.Scale > 0.8) do
        minibar.Position.X.Scale = minibar.Position.X.Scale - 0.01
        wait()
    end
end

function hide()
    while (minibar.Position.X.Scale < 1) do
        minibar.Position.X.Scale = minibar.Position.X.Scale + 0.01
        wait()
    end
end

print("wait3") -- So it doesn't start directly
wait(3)
show()
print("wait1") -- Stops animation for 1 second
wait(1)
hide()
print("wait0")