Gui Dance Dance Revolution Error?

Hello, I am trying to develop a Gui DDR game on ROBLOX.

Currently I keep getting an output error. What this code is "suppose" to do is launch the frames to the designated area randomly. I keep getting this error:

16:41:39.467 - Unable to load plugin icon. Image may have an invalid or unknown format. 16:41:40.517 - Unable to cast double to token 16:41:40.517 - Script 'Players.Player1.PlayerGui.GuiGame.DDR.Script', Line 18 - global Left 16:41:40.518 - Script 'Players.Player1.PlayerGui.GuiGame.DDR.Script', Line 30 16:41:40.518 - Stack End

-- -0.137y

--Variables

c=script.Parent
L1=c.Lane1
L2=c.Lane2
L3=c.Lane3
L4=c.Lane4
PB=c.PowerBar
CC=c.ComboCounter

-- functions test

function Left()
    L1.A1:TweenPosition(UDim2.new(0,0,-0.137,0),4)
end
function Down()
    L2.A2:TweenPosition(UDim2.new(0,0,-0.137,0),4)
end
function Up()
    L3.A3:TweenPosition(UDim2.new(0,0,-0.137,0),4)
end
function Right()
    L4.A4:TweenPosition(UDim2.new(0,0,-0.137,0),4)
end
--Events Test +Global Tables
Fire = { Left(), Down(), Up(),Right()}
while true do
wait(1)
Fire(math.random(1,4))
end