How do I insert a GUI with LoadAsset?

local SCI = pcall(function()
    return insertservice:LoadAsset(3750380093)
end)

game.Players.PlayerAdded:Connect(function(plr)
    SCI.Parent = plr.PlayerGui
end)

Even after looking at roblox's tutorial at https://developer.roblox.com/en-us/api-reference/function/InsertService/LoadAsset

It still won't insert