invalid score

I was working on some music when the window closed out completely. When I tried to open it back up, it kept saying the score was invalid. I wasn't able to post the score online or even save it before this happened, and I lost a lot of progress from this random error. Even when I go to upload a score on the website, it just says access denied. Anyway, I need that score back; there's no reason for it to have been ruined on its own accord. I have seen similar complaints online, yet there has been no formal feedback. Please help me retrieve at least a pdf/photo of the score; it's the first one I've made. I really enjoy using this program; I don't want to stop because of a random crash.