This works in test mode, but no in-game?

OK so I have a GUI called "greenpower" and It's current Parent is ServerStorage.

I also have a tool and when i activate it (clicking) the GUI is supposed to move to the Player's PlayerGui.

This works just fine in test mode, but in actual game it doesn't.

LocalScript:

local player = game.Players.LocalPlayer
local power = game.ServerStorage:WaitForChild("greenpower")
local plrgui = player:WaitForChild("PlayerGui")
script.Parent.Activated:connect(function()
    power:Clone().Parent = plrgui

end)

Help?