Why is my PreloadAsync script returning preload errors for everything I try to load?

I made a preloading script using PreloadAsync, but my console ends up getting spammed with "ContentProvider:PreloadAsync() failed for (insert asset here)", my script: (localscript in StarterPlayerScripts)

local ContentProvider = game:GetService("ContentProvider")

ContentProvider:PreloadAsync(workspace.Assets:GetChildren())

script:Destroy()

I don't know will this work but try it.

local ContentProvider = game:GetService("ContentProvider")

ContentProvider:PreloadAsync(game:GetService("Workspace"):WaitForChild("Assets"):GetChildren())

wait(2)
script:Destroy()