Why doesn't this work online?

It worked just fine in solo

the output says nothing, used to say "Stockoverlay is not a member of stockcore" even though it clearly was a member(and it was loaded btw) What is going on is this some kind of bug?

    sword = script.Parent.Sword
    script.Parent:WaitForChild("Stockoverlay")
    Overlay = script.Parent.Stockoverlay

function selected()

    if script.Parent.Selected.Value == false then
        script.Parent.Selected.Value = true
        script.Parent.Select:Play()
        sword.Parent = game.Players.LocalPlayer.Character
    for i = 0,1,0.1 do
        Overlay.ImageTransparency = Overlay.ImageTransparency - 0.1
        wait(0.01)
    end

    else
        script.Parent.Selected.Value = false
        sword.Parent = script.Parent
        script.Parent.Deselect:Play()
        for i = 0,1,0.1 do


        Overlay.ImageTransparency = Overlay.ImageTransparency + 0.1
        wait(0.01)
    end
    end

end

function onKeyPress(inputObject, gameProcessedEvent)
    if inputObject.KeyCode == Enum.KeyCode.One then
        print("NoireSword")
        selected()
    end
end

function onKeyPress2(inputObject, gameProcessedEvent)
     if inputObject.KeyCode == Enum.KeyCode.Two  then
        deselect()
    end
    end

function deselect()
        if script.Parent.Selected.Value == true then

        script.Parent.Selected.Value = false
        sword.Parent = script.Parent
        script.Parent.Deselect:Play()
        for i = 0,1,0.1 do
        Overlay.ImageTransparency = Overlay.ImageTransparency + 0.1
        wait(0.01)
        end
        end
        end

game:GetService("UserInputService").InputBegan:connect(onKeyPress)
game:GetService("UserInputService").InputBegan:connect(onKeyPress2)