Oh, I am so sorry to hear that Ksenija. If it wasn’t saved at all, then there’s nothing we can do. We do have an autosave function, but unless you turned it on, then that is not much help either.
Remember, Animation Paper is in development, so bugs like this must be expected – even though it is very unfortunate. You need to save once in a while – or use the autosave.
Do you remember what it was you were doing when it happened? Did it show any error message or something else? Did Animation Paper just suddenly close? Please describe it as best as you can. Also what computer OS and version you are using. Important information, so we can rid of this problem. Of course it doesn’t hep you with your 2 hours of work. Sadly.