Why wont these random CFrame angles work?

local	Debri = Instance.new("Part")
		Debri.BrickColor = part.BrickColor
		Debri.Material = part.Material
		Debri.Anchored = true
		Debri.CanCollide = true	
		Debri.Size = Vector3.new(math.random(5, 20), 4, math.random(5, 20))
		Debri.CFrame = CFrame.new(Carbons[DMGSelect].Position) * CFrame.Angles(math.random(math.pi/1.2 , -math.pi/1.2), math.random(math.pi/1.2 , -math.pi/1.2), math.random(math.pi/1.2 , -math.pi/1.2))
		Debri.Parent = workspace	
		Debri.TopSurface = 10
		Debri.BottomSurface = 10

It keeps giving me an error that says Players.Player.Backpack.DebriScript:07: bad argument #2 to 'random' (interval is empty)

I don't know why this happens please help.