Invalid/lost

Hi. I’m a Toon Boom Studio 8 user and I’ve been trouble to open one of my file and it keep saying file is in valid because a couple minute ago I was doing my animation and suddenly my computer turn off due to I forgot to turn on my laptop battery and when I turned it on back the file cannot be opened and I tried to restore it or find a back up but it’s nowhere to be found. Can someone help me with this problem. It is really important to me. That scene take me a whole night to complete it and now it’s gone…