Failed to load resource (theme does not load)

Hi!
My website http://www.pinly.se worked fine a week ago and I have not made any changes since start of December.
But now when it loads its just pure html, no css, plugins etc.
If I look in the console it gives me the message (Failed to load resource: the server responded with a status of 404 (Not Found)).
I have now updated all plugins, but that does not help.
I do have an update for the theme, is it possible that will solve the issue?
Would really appreciate som help, I don’t know how to solve this myself.

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