how do i fix 16:11:18.310 - er is not a valid member of PlayerGui ?

the error: 16:11:18.310 - er is not a valid member of PlayerGui

game.ReplicatedStorage.Transfromgold.UNDOTRANS.OnServerEvent:Connect(function(plr)
		
	
local chr = plr.Character
local hum = chr.Humanoid

		for _,none in pairs(hum:GetChildren()) do
			if none:IsA("NumberValue") then
				none:Remove()
			end
		end
		wait(.12)
local waited = plr.PlayerGui.er:WaitForChild("er")
				for _,kill in pairs(waited:GetChildren()) do
					if kill:IsA("NumberValue") then
					local copy = kill:Clone()
					wait(.12)
						copy.Parent = hum
					end
				end
		

end)
		

end)

the firing script

local tem = "None"
local InputService = game:GetService("UserInputService")
InputService.InputBegan:Connect(function(input)


-- on 

    local key = input.KeyCode 
    if key == Enum.KeyCode.R then
	game.ReplicatedStorage.Transfromgold.Trans:FireServer()
   print("fired")
	end
end)
-----




InputService.InputBegan:Connect(function(input)
	
	local plr = game.Players.LocalPlayer
local chr = plr.Character
local hum = chr.Humanoid
    local key = input.KeyCode 
    if key == Enum.KeyCode.E then

	game.ReplicatedStorage.Transfromgold.UNDOTRANS:FireServer()
end
end)