0 Splash screen ImageLabel Script assign to part 2?

I am having problems with loading a splash screen before the game starts. This is just an excerpt from the local script in ReplicatedFirst

local screen = Instance.new("ScreenGui")
screen.Parent = PlayerGui

local splashscreen = Instance.new("ImageLabel")
splashscreen.Size = UDim2.new(1,0,1,0)
splashscreen.Image = "rbxassetid://76819021"
splashscreen.Parent = screen

It always says 'Request Failed' and I'm not sure why

it's not a valid image