Paste GUI into localplayer?

Its a level up gui that will pop up, then go nil afterwards. But it doesn't above the Local Player's Head

local player = game.Players.LocalPlayer.Character

local gui = Instance.new("BillboardGui",workspace)
	gui.Name = "LEVELUP"
	gui.Size = UDim2.new(5,0,2,0)
	gui.ExtentsOffset = Vector3.new(0,8,0)
		Instance.new("Frame",gui)
		gui.Frame.Size = UDim2.new(1,0,2,0)
		gui.Frame.BorderSizePixel = 0

local Image		= Instance.new("ImageLabel",gui.Frame)

Image.BorderSizePixel 			= 2
Image.BorderColor3				= Color3.new(20/255,20/255,20/255)
Image.Size						= UDim2.new(1,0,1,0)
Image.Image						= "rbxassetid://167251759"

local TextLabel = Instance.new("TextLabel",gui.Frame)

TextLabel.Size						= UDim2.new(1,0,1,0)
TextLabel.Font 						= "ArialBold"
TextLabel.Text						= "LEVEL UP"
TextLabel.FontSize					= Enum.FontSize.Size28
TextLabel.TextScaled				= true
TextLabel.TextWrapped				= true
TextLabel.BackgroundTransparency	= 1
TextLabel.TextStrokeColor3			= Color3.new(100/255,100/255,100/255)
TextLabel.TextStrokeTransparency	= 0
TextLabel.TextColor3				= Color3.new(255/255,200/255,50/255)
TextLabel.BorderSizePixel 			= 0

gui.Parent = player.Head

wait(5)

gui.Parent = nil

local player = game.Players.LocalPlayer.Character -- Here we got the problem.

local gui = Instance.new("BillboardGui",workspace)
    gui.Name = "LEVELUP"
    gui.Size = UDim2.new(5,0,2,0)
    gui.ExtentsOffset = Vector3.new(0,8,0)
        Instance.new("Frame",gui)
        gui.Frame.Size = UDim2.new(1,0,2,0)
        gui.Frame.BorderSizePixel = 0

local Image     = Instance.new("ImageLabel",gui.Frame)

Image.BorderSizePixel           = 2
Image.BorderColor3              = Color3.new(20/255,20/255,20/255)
Image.Size                      = UDim2.new(1,0,1,0)
Image.Image                     = "rbxassetid://167251759"

local TextLabel = Instance.new("TextLabel",gui.Frame)

TextLabel.Size                      = UDim2.new(1,0,1,0)
TextLabel.Font                      = "ArialBold"
TextLabel.Text                      = "LEVEL UP"
TextLabel.FontSize                  = Enum.FontSize.Size28
TextLabel.TextScaled                = true
TextLabel.TextWrapped               = true
TextLabel.BackgroundTransparency    = 1
TextLabel.TextStrokeColor3          = Color3.new(100/255,100/255,100/255)
TextLabel.TextStrokeTransparency    = 0
TextLabel.TextColor3                = Color3.new(255/255,200/255,50/255)
TextLabel.BorderSizePixel           = 0

gui.Parent = player.Head

wait(5)

gui.Parent = nil

If a script tries getting the LocalPlayer then it HAS to be in the player. So if this script is in workspace then the LocalPlayer will be nil, causing the rest of this script to break. Just put this entire script into StarterGui and modify it to your likings, hope this has helped.